on *:START:{
  timer 0:00 1 1 reset
}

alias reset {
  unset %ban.*
  timer 0:00 1 1 reset
}

on *:BAN:#CHAN:{
  inc %ban. [ $+ [ $nick ] ]
  if (%ban. [ $+ [ $nick ] ] > [number of bans allowed a day]) {
    ban -k #CHAN $nick 1
  }
}