diff --git a/docs/sections/user_guide/cli/drivers/upp/run-help.out b/docs/sections/user_guide/cli/drivers/upp/run-help.out
index 2e0c9206b..d727fd2ad 100644
--- a/docs/sections/user_guide/cli/drivers/upp/run-help.out
+++ b/docs/sections/user_guide/cli/drivers/upp/run-help.out
@@ -9,7 +9,7 @@ Required arguments:
   --cycle CYCLE
       The cycle in ISO8601 format (e.g. 2024-05-23T18)
   --leadtime LEADTIME
-      The leadtime as HH[:MM[:SS]]
+      The leadtime as hours[:minutes[:seconds]]
 
 Optional arguments:
   -h, --help
diff --git a/docs/sections/user_guide/cli/tools/file/copy-help.out b/docs/sections/user_guide/cli/tools/file/copy-help.out
index a38f16b9f..8afa28e7f 100644
--- a/docs/sections/user_guide/cli/tools/file/copy-help.out
+++ b/docs/sections/user_guide/cli/tools/file/copy-help.out
@@ -19,7 +19,7 @@ Optional arguments:
   --cycle CYCLE
       The cycle in ISO8601 format (e.g. 2024-05-29T12)
   --leadtime LEADTIME
-      The leadtime as HH[:MM[:SS]]
+      The leadtime as hours[:minutes[:seconds]]
   --dry-run
       Only log info, making no changes
   --quiet, -q
diff --git a/docs/sections/user_guide/cli/tools/file/link-help.out b/docs/sections/user_guide/cli/tools/file/link-help.out
index 45a774402..633ce6d8c 100644
--- a/docs/sections/user_guide/cli/tools/file/link-help.out
+++ b/docs/sections/user_guide/cli/tools/file/link-help.out
@@ -19,7 +19,7 @@ Optional arguments:
   --cycle CYCLE
       The cycle in ISO8601 format (e.g. 2024-05-29T12)
   --leadtime LEADTIME
-      The leadtime as HH[:MM[:SS]]
+      The leadtime as hours[:minutes[:seconds]]
   --dry-run
       Only log info, making no changes
   --quiet, -q
diff --git a/recipe/meta.json b/recipe/meta.json
index 09cf57924..05052a59a 100644
--- a/recipe/meta.json
+++ b/recipe/meta.json
@@ -32,5 +32,5 @@
       "pyyaml =6.0.*"
     ]
   },
-  "version": "2.3.1"
+  "version": "2.3.2"
 }
diff --git a/src/uwtools/cli.py b/src/uwtools/cli.py
index 0fa176f1b..82146cb18 100644
--- a/src/uwtools/cli.py
+++ b/src/uwtools/cli.py
@@ -4,6 +4,7 @@
 
 import datetime as dt
 import json
+import re
 import sys
 from argparse import ArgumentParser as Parser
 from argparse import HelpFormatter
@@ -27,7 +28,7 @@
 from uwtools.utils.file import get_file_format, resource_path
 
 FORMATS = FORMAT.extensions()
-LEADTIME_DESC = "HH[:MM[:SS]]"
+LEADTIME_DESC = "hours[:minutes[:seconds]]"
 TITLE_REQ_ARG = "Required arguments"
 
 Args = Dict[str, Any]
@@ -995,7 +996,7 @@ def _dispatch_to_driver(name: str, args: Args) -> bool:
     }
     if cycle := args.get(STR.cycle):
         kwargs[STR.cycle] = cycle
-    if leadtime := args.get(STR.leadtime):
+    if (leadtime := args.get(STR.leadtime)) is not None:
         kwargs[STR.leadtime] = leadtime
     return execute(**kwargs)
 
@@ -1077,13 +1078,9 @@ def _timedelta_from_str(tds: str) -> dt.timedelta:
 
     :param tds: The timedelta string to parse.
     """
-    fmts = ("%H:%M:%S", "%H:%M", "%H")
-    for fmt in fmts:
-        try:
-            t = dt.datetime.strptime(tds, fmt)
-            return dt.timedelta(hours=t.hour, minutes=t.minute, seconds=t.second)
-        except ValueError:
-            pass
+    if matches := re.match(r"(\d+)(:(\d+))?(:(\d+))?", tds):
+        h, m, s = [int(matches.groups()[n] or 0) for n in (0, 2, 4)]
+        return dt.timedelta(hours=h, minutes=m, seconds=s)
     _abort(f"Specify leadtime as {LEADTIME_DESC}")
 
 
diff --git a/src/uwtools/drivers/chgres_cube.py b/src/uwtools/drivers/chgres_cube.py
index e429025d2..a37b1639e 100644
--- a/src/uwtools/drivers/chgres_cube.py
+++ b/src/uwtools/drivers/chgres_cube.py
@@ -59,6 +59,7 @@ def namelist_file(self):
         ] + [
             Path(config_files["data_dir_input_grid"]) / config_files[k]
             for k in ("atm_files_input_grid", "grib2_file_input_grid", "sfc_files_input_grid")
+            if k in config_files
         ]
         yield [file(input_path) for input_path in input_paths]
         self._create_user_updated_config(
diff --git a/src/uwtools/drivers/driver.py b/src/uwtools/drivers/driver.py
index 5de6330a4..5a61f5a4a 100644
--- a/src/uwtools/drivers/driver.py
+++ b/src/uwtools/drivers/driver.py
@@ -51,12 +51,13 @@ def __init__(
         dryrun(enable=dry_run)
         self._config = YAMLConfig(config=config)
         self._batch = batch
-        if leadtime and not cycle:
+        has_leadtime = leadtime is not None
+        if has_leadtime and not cycle:
             raise UWError("When leadtime is specified, cycle is required")
         self._config.dereference(
             context={
                 **({"cycle": cycle} if cycle else {}),
-                **({"leadtime": leadtime} if leadtime else {}),
+                **({"leadtime": leadtime} if has_leadtime else {}),
                 **self._config.data,
             }
         )
diff --git a/src/uwtools/resources/info.json b/src/uwtools/resources/info.json
index 948e92c4d..c5a6a6831 100644
--- a/src/uwtools/resources/info.json
+++ b/src/uwtools/resources/info.json
@@ -1,4 +1,4 @@
 {
-  "version": "2.3.1",
+  "version": "2.3.2",
   "buildnum": "0"
 }
diff --git a/src/uwtools/tests/drivers/test_driver.py b/src/uwtools/tests/drivers/test_driver.py
index eff8efa59..d09e12967 100644
--- a/src/uwtools/tests/drivers/test_driver.py
+++ b/src/uwtools/tests/drivers/test_driver.py
@@ -129,7 +129,7 @@ def driverobj(config):
     )
 
 
-# Asset Tests
+# Assets Tests
 
 
 def test_Assets(assetobj):
@@ -137,14 +137,15 @@ def test_Assets(assetobj):
     assert assetobj._batch is True
 
 
-def test_Asset_cycle_leadtime_error(config):
+@pytest.mark.parametrize("hours", [0, 24, 168])
+def test_Assets_cycle_leadtime_error(config, hours):
     with raises(UWError) as e:
-        ConcreteAssets(config=config, leadtime=dt.timedelta(hours=24))
+        ConcreteAssets(config=config, leadtime=dt.timedelta(hours=hours))
     assert "When leadtime is specified, cycle is required" in str(e)
 
 
 @pytest.mark.parametrize("val", (True, False))
-def test_Asset_dry_run(config, val):
+def test_Assets_dry_run(config, val):
     with patch.object(driver, "dryrun") as dryrun:
         ConcreteAssets(config=config, dry_run=val)
         dryrun.assert_called_once_with(enable=val)
@@ -165,7 +166,7 @@ def test_key_path(config):
     assert config == assetobj._config
 
 
-def test_Asset_validate(caplog, assetobj):
+def test_Assets_validate(assetobj, caplog):
     log.setLevel(logging.INFO)
     assetobj.validate()
     assert regex_logged(caplog, "State: Ready")
@@ -183,8 +184,8 @@ def test_Asset_validate(caplog, assetobj):
         (True, True, {"a": 33, "b": 22}),
     ],
 )
-def test_Asset__create_user_updated_config_base_file(
-    base_file, assetobj, expected, tmp_path, update_values
+def test_Assets__create_user_updated_config_base_file(
+    assetobj, base_file, expected, tmp_path, update_values
 ):
     path = tmp_path / "updated.yaml"
     dc = assetobj._driver_config
@@ -198,14 +199,14 @@ def test_Asset__create_user_updated_config_base_file(
     assert updated == expected
 
 
-def test_Asset__driver_config_fail(assetobj):
+def test_Assets__driver_config_fail(assetobj):
     del assetobj._config["concrete"]
     with raises(UWConfigError) as e:
         assert assetobj._driver_config
     assert str(e.value) == "Required 'concrete' block missing in config"
 
 
-def test_Asset__driver_config_pass(assetobj):
+def test_Assets__driver_config_pass(assetobj):
     assert set(assetobj._driver_config.keys()) == {
         "base_file",
         "execution",
@@ -214,11 +215,11 @@ def test_Asset__driver_config_pass(assetobj):
     }
 
 
-def test_Asset__rundir(assetobj):
-    assert assetobj._rundir == Path("/path/to/2024032218/run")
+def test_Assets__rundir(assetobj):
+    assert assetobj._rundir == Path(assetobj._driver_config["run_dir"])
 
 
-def test_Asset__validate(assetobj):
+def test_Assets__validate(assetobj):
     with patch.object(assetobj, "_validate", driver.Assets._validate):
         with patch.object(driver, "validate_internal") as validate_internal:
             assetobj._validate(assetobj)
diff --git a/src/uwtools/tests/test_cli.py b/src/uwtools/tests/test_cli.py
index 9dac1f6a9..abb0b4e8c 100644
--- a/src/uwtools/tests/test_cli.py
+++ b/src/uwtools/tests/test_cli.py
@@ -545,10 +545,11 @@ def test__dispatch_template_translate_no_optional():
     )
 
 
-def test__dispatch_to_driver():
+@pytest.mark.parametrize("hours", [0, 24, 168])
+def test__dispatch_to_driver(hours):
     name = "adriver"
     cycle = dt.datetime.now()
-    leadtime = dt.timedelta(hours=24)
+    leadtime = dt.timedelta(hours=hours)
     args: dict = {
         "action": "foo",
         "batch": True,
@@ -646,9 +647,10 @@ def test__switch():
 
 
 def test__timedelta_from_str(capsys):
-    assert cli._timedelta_from_str("11:12:13") == dt.timedelta(hours=11, minutes=12, seconds=13)
-    assert cli._timedelta_from_str("11:12") == dt.timedelta(hours=11, minutes=12)
-    assert cli._timedelta_from_str("11") == dt.timedelta(hours=11)
+    assert cli._timedelta_from_str("111:222:333").total_seconds() == 111 * 3600 + 222 * 60 + 333
+    assert cli._timedelta_from_str("111:222").total_seconds() == 111 * 3600 + 222 * 60
+    assert cli._timedelta_from_str("111").total_seconds() == 111 * 3600
+    assert cli._timedelta_from_str("01:15:07").total_seconds() == 1 * 3600 + 15 * 60 + 7
     with raises(SystemExit):
         cli._timedelta_from_str("foo")
     assert f"Specify leadtime as {cli.LEADTIME_DESC}" in capsys.readouterr().err
diff --git a/src/uwtools/tests/utils/test_api.py b/src/uwtools/tests/utils/test_api.py
index cab2f799b..ba19afd92 100644
--- a/src/uwtools/tests/utils/test_api.py
+++ b/src/uwtools/tests/utils/test_api.py
@@ -5,10 +5,10 @@
 from unittest.mock import patch
 
 import pytest
-import yaml
 from pytest import fixture, raises
 
 from uwtools.exceptions import UWError
+from uwtools.tests.drivers import test_driver
 from uwtools.tests.drivers.test_driver import ConcreteDriver
 from uwtools.utils import api
 
@@ -118,20 +118,19 @@ def test_str2path_convert():
     assert result == Path(val)
 
 
-def test__execute(execute_kwargs, tmp_path):
-    config = tmp_path / "config.yaml"
-    with open(config, "w", encoding="utf-8") as f:
-        yaml.dump({"some": "config"}, f)
+@pytest.mark.parametrize("hours", [0, 24, 168])
+def test__execute(execute_kwargs, hours, tmp_path):
     graph_file = tmp_path / "g.dot"
-    kwargs = {
-        **execute_kwargs,
-        "driver_class": ConcreteDriver,
-        "config": config,
-        "cycle": dt.datetime.now(),
-        "leadtime": dt.timedelta(hours=24),
-        "graph_file": graph_file,
-    }
-    assert not graph_file.is_file()
-    with patch.object(ConcreteDriver, "_validate"):
+    with patch.object(test_driver, "ConcreteDriver", wraps=test_driver.ConcreteDriver) as cd:
+        kwargs = {
+            **execute_kwargs,
+            "driver_class": cd,
+            "config": {"some": "config"},
+            "cycle": dt.datetime.now(),
+            "leadtime": dt.timedelta(hours=hours),
+            "graph_file": graph_file,
+        }
+        assert not graph_file.is_file()
         assert api._execute(**kwargs) is True
+        assert cd.call_args.kwargs["leadtime"] == dt.timedelta(hours=hours)
     assert graph_file.is_file()
diff --git a/src/uwtools/utils/api.py b/src/uwtools/utils/api.py
index 6e36fb205..6f93898c1 100644
--- a/src/uwtools/utils/api.py
+++ b/src/uwtools/utils/api.py
@@ -199,7 +199,7 @@ def _execute(
     )
     if cycle:
         kwargs["cycle"] = cycle
-    if leadtime:
+    if leadtime is not None:
         kwargs["leadtime"] = leadtime
     obj = driver_class(**kwargs)
     getattr(obj, task)()