Timed rules
Timed rules specify the amount of time, in seconds, that the filter rule is applied after it is made effective with the mkfilt -v [4|6] -u command.
The expiration time is specified with the genfilt -e command. For more information, see the mkfilt and genfilt commands.
Note: Timers have no effect on IF, ELSE or ENDIF rules. If an
expiration time is specified in a shun host or shun port rule, the time applies
only to the effect rule that is initiated by the shun rule. Shun rules have
no expiration time.