Try to add this into your code but it must exist the %tiem variable if NOT then 2 days will be used to unset the %cache and %lastkill

Help details:

/help /timer
/help $timer

Code:
.timer[EXPIRE_ $+ $chan $+ _ $+ $nick $+ ] 1 $iif(%tiem && %tiem isnum,$v1,172.8) unset %cache %lastkill

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