you sure its not 300 meaning 5 mins as in 300 secondsi think it some thing like this
[@Skele]
#IF
checkslavecount < 5 (meaning you can only have 5
#ACT
recallmob Skeleton 7 1 5 (7 meaning level 7)(1meaning 1pet)(5meaning 5mins)
close
#ELSESAY
Sorry you have too many pets!\
<Ooops/@exit>\