Something

on *:TEXT:!tb*:#:{
  if ($nick isop $chan || $nick ishop $chan) {
    if (!$3 || $2 !isnum) {
      notice $nick You must supply in this format: !tb <minutes> <nick> <reason>
    }
    else {
      ban -ku $+ $calc( $2 * 60 ) $chan $3 Timebanned! Minutes: $2 Reason: $4-
    }
  }
}