diff --git a/NEWS b/NEWS
index f5888b0a9..f566233df 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 1.6.2.dev0
  * #523: Reduce the default consistency check frequency and support configuring the frequency
-   independently for each check. See the documentation for more information:
+   independently for each check. Also add "borgmatic check --force" flag to ignore configured
+   frequencies. See the documentation for more information:
    https://torsion.org/borgmatic/docs/how-to/deal-with-very-large-backups/#check-frequency
  * #536: Fix generate-borgmatic-config to support more complex schema changes like the new
    Healthchecks configuration options when the "--source" flag is used.
diff --git a/borgmatic/borg/check.py b/borgmatic/borg/check.py
index f92e49ab2..0657b2a97 100644
--- a/borgmatic/borg/check.py
+++ b/borgmatic/borg/check.py
@@ -81,8 +81,8 @@ def parse_frequency(frequency):
         time_unit += 's'
 
     if time_unit == 'months':
-        number *= 4
-        time_unit = 'weeks'
+        number *= 30
+        time_unit = 'days'
     elif time_unit == 'years':
         number *= 365
         time_unit = 'days'
@@ -93,11 +93,13 @@ def parse_frequency(frequency):
         raise ValueError(f"Could not parse consistency check frequency '{frequency}'")
 
 
-def filter_checks_on_frequency(location_config, consistency_config, borg_repository_id, checks):
+def filter_checks_on_frequency(
+    location_config, consistency_config, borg_repository_id, checks, force
+):
     '''
     Given a location config, a consistency config with a "checks" sequence of dicts, a Borg
-    repository ID, and sequence of checks, filter down those checks based on the configured
-    "frequency" for each check as compared to its check time file.
+    repository ID, a sequence of checks, and whether to force checks to run, filter down those
+    checks based on the configured "frequency" for each check as compared to its check time file.
 
     In other words, a check whose check time file's timestamp is too new (based on the configured
     frequency) will get cut from the returned sequence of checks. Example:
@@ -119,6 +121,9 @@ def filter_checks_on_frequency(location_config, consistency_config, borg_reposit
     '''
     filtered_checks = list(checks)
 
+    if force:
+        return tuple(filtered_checks)
+
     for check_config in consistency_config.get('checks', DEFAULT_CHECKS):
         check = check_config['name']
         if checks and check not in checks:
@@ -240,6 +245,7 @@ def check_archives(
     progress=None,
     repair=None,
     only_checks=None,
+    force=None,
 ):
     '''
     Given a local or remote repository path, a storage config dict, a consistency config dict,
@@ -269,6 +275,7 @@ def check_archives(
         consistency_config,
         borg_repository_id,
         parse_checks(consistency_config, only_checks),
+        force,
     )
     check_last = consistency_config.get('check_last', None)
     lock_wait = None
diff --git a/borgmatic/commands/arguments.py b/borgmatic/commands/arguments.py
index cb0c5dc7b..95f8a10f1 100644
--- a/borgmatic/commands/arguments.py
+++ b/borgmatic/commands/arguments.py
@@ -346,7 +346,7 @@ def make_parsers():
         dest='repair',
         default=False,
         action='store_true',
-        help='Attempt to repair any inconsistencies found (experimental and only for interactive use)',
+        help='Attempt to repair any inconsistencies found (for interactive use)',
     )
     check_group.add_argument(
         '--only',
@@ -356,6 +356,12 @@ def make_parsers():
         action='append',
         help='Run a particular consistency check (repository, archives, data, or extract) instead of configured checks (subject to configured frequency, can specify flag multiple times)',
     )
+    check_group.add_argument(
+        '--force',
+        default=False,
+        action='store_true',
+        help='Ignore configured check frequencies and run checks unconditionally',
+    )
     check_group.add_argument('-h', '--help', action='help', help='Show this help message and exit')
 
     extract_parser = subparsers.add_parser(
diff --git a/borgmatic/commands/borgmatic.py b/borgmatic/commands/borgmatic.py
index efc803f57..4fac16558 100644
--- a/borgmatic/commands/borgmatic.py
+++ b/borgmatic/commands/borgmatic.py
@@ -403,6 +403,7 @@ def run_actions(
             progress=arguments['check'].progress,
             repair=arguments['check'].repair,
             only_checks=arguments['check'].only,
+            force=arguments['check'].force,
         )
         command.execute_hook(
             hooks.get('after_check'),
diff --git a/docs/how-to/deal-with-very-large-backups.md b/docs/how-to/deal-with-very-large-backups.md
index 447f90a74..2a6bff44e 100644
--- a/docs/how-to/deal-with-very-large-backups.md
+++ b/docs/how-to/deal-with-very-large-backups.md
@@ -96,6 +96,9 @@ within `~/.borgmatic/checks`). If it hasn't been long enough, the check is
 skipped. And you still have to run `borgmatic check` (or just `borgmatic`) in
 order for checks to run, even when a `frequency` is configured!
 
+If you want to temporarily ignore your configured frequencies, you can invoke
+`borgmatic check --force` to run checks unconditionally.
+
 
 ### Disabling checks
 
@@ -129,7 +132,7 @@ borgmatic check --only data --only extract
 
 This is useful for running slow consistency checks on an infrequent basis,
 separate from your regular checks. It is still subject to any configured
-check frequencies.
+check frequencies unless the `--force` flag is used.
 
 
 ## Troubleshooting
diff --git a/tests/unit/borg/test_check.py b/tests/unit/borg/test_check.py
index 1f69d6ad3..6cd84b1f6 100644
--- a/tests/unit/borg/test_check.py
+++ b/tests/unit/borg/test_check.py
@@ -83,8 +83,8 @@ def test_parse_checks_with_override_data_check_also_injects_archives():
         ('2 days', module.datetime.timedelta(days=2)),
         ('1 week', module.datetime.timedelta(weeks=1)),
         ('2 weeks', module.datetime.timedelta(weeks=2)),
-        ('1 month', module.datetime.timedelta(weeks=4)),
-        ('2 months', module.datetime.timedelta(weeks=8)),
+        ('1 month', module.datetime.timedelta(days=30)),
+        ('2 months', module.datetime.timedelta(days=60)),
         ('1 year', module.datetime.timedelta(days=365)),
         ('2 years', module.datetime.timedelta(days=365 * 2)),
     ),
@@ -113,12 +113,17 @@ def test_filter_checks_on_frequency_without_config_uses_default_checks():
         consistency_config={},
         borg_repository_id='repo',
         checks=('repository', 'archives'),
+        force=False,
     ) == ('repository', 'archives')
 
 
 def test_filter_checks_on_frequency_retains_unconfigured_check():
     assert module.filter_checks_on_frequency(
-        location_config={}, consistency_config={}, borg_repository_id='repo', checks=('data',),
+        location_config={},
+        consistency_config={},
+        borg_repository_id='repo',
+        checks=('data',),
+        force=False,
     ) == ('data',)
 
 
@@ -130,6 +135,7 @@ def test_filter_checks_on_frequency_retains_check_without_frequency():
         consistency_config={'checks': [{'name': 'archives'}]},
         borg_repository_id='repo',
         checks=('archives',),
+        force=False,
     ) == ('archives',)
 
 
@@ -147,6 +153,7 @@ def test_filter_checks_on_frequency_retains_check_with_elapsed_frequency():
         consistency_config={'checks': [{'name': 'archives', 'frequency': '1 hour'}]},
         borg_repository_id='repo',
         checks=('archives',),
+        force=False,
     ) == ('archives',)
 
 
@@ -162,6 +169,7 @@ def test_filter_checks_on_frequency_retains_check_with_missing_check_time_file()
         consistency_config={'checks': [{'name': 'archives', 'frequency': '1 hour'}]},
         borg_repository_id='repo',
         checks=('archives',),
+        force=False,
     ) == ('archives',)
 
 
@@ -178,11 +186,22 @@ def test_filter_checks_on_frequency_skips_check_with_unelapsed_frequency():
             consistency_config={'checks': [{'name': 'archives', 'frequency': '1 hour'}]},
             borg_repository_id='repo',
             checks=('archives',),
+            force=False,
         )
         == ()
     )
 
 
+def test_filter_checks_on_frequency_restains_check_with_unelapsed_frequency_and_force():
+    assert module.filter_checks_on_frequency(
+        location_config={},
+        consistency_config={'checks': [{'name': 'archives', 'frequency': '1 hour'}]},
+        borg_repository_id='repo',
+        checks=('archives',),
+        force=True,
+    ) == ('archives',)
+
+
 def test_make_check_flags_with_repository_check_returns_flag():
     flags = module.make_check_flags(('repository',))
 
diff --git a/tests/unit/commands/test_borgmatic.py b/tests/unit/commands/test_borgmatic.py
index 3a2c4f174..6918d4e73 100644
--- a/tests/unit/commands/test_borgmatic.py
+++ b/tests/unit/commands/test_borgmatic.py
@@ -468,7 +468,9 @@ def test_run_actions_calls_hooks_for_check_action():
     flexmock(module.command).should_receive('execute_hook').twice()
     arguments = {
         'global': flexmock(monitoring_verbosity=1, dry_run=False),
-        'check': flexmock(progress=flexmock(), repair=flexmock(), only=flexmock()),
+        'check': flexmock(
+            progress=flexmock(), repair=flexmock(), only=flexmock(), force=flexmock()
+        ),
     }
 
     list(