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+Setting: URLM_LOG_TRIM_INTERVAL
+
+  How often (in seconds) do you want urlmanager to check the log and
+  trim it according to your urlm_max_log_lines and/or urlm_max_log_age
+  settings? Default is 3600 seconds (1 hour), which is probably OK for
+  most users. If you're in a lot of channels and exchange URLs with lots
+  of people, you might want to decrease this to keep the log from growing
+  too much.
+
+  Note: urlm_log_trim_interval has no effect unless one or both of the
+  urlm_max_log_lines or urlm_max_log_age settings are set to non-zero
+  values.
+
+  Note: Even with this setting set to zero, log trimming still occurs
+  at startup (unless urlm_log_trim_startup is OFF), and whenever a URL
+  is captured. To completely disable log trimming, set both
+  urlm_max_log_lines and urlm_max_log_age to zero. With these settings,
+  even manual trimming with /urlm_trim_log will do nothing.
+
+  The lower you set this setting, the more CPU and disk access it requires
+  (unless you set it to zero, of course). Probably it's a bad idea to
+  use a value lower than 60 seconds here, under any conditions.
+