on *:text:xy, kb *:#:{ 
  if  (($nick isop $chan) || ($nick ishop $chan)) {
    if ($4 isnum 1-200) { 
      //ban -ku $+ $calc( $4 *60 ) $chan $3 2 You have been banned for $4 minute(s) by $nick ( $+ $5- $+ )  
    }
  }
  if ($3- != $num) {
    /ban -k $chan $3 2
  }
}