Forums Scripts & Popups need help with a set mode script :)

300 sec or any other timing , i just want to +m the channel for a given time if somebody /part the channel with some message. There are some flooders ,spammers who join/part quickly with a part message i dont want to ban reach clone flooder but rather +m the channel for a short time after receiving the first /part message.Right now the script i use bans the ips
on @*:PART:#:{
IF ( e isin $strip($1-)) {
ban -u999960 # $nick 11
}
}
but i want to +m with a timer l after IF ( e isin $strip($1-)) is received