on *:text:!tkb *:#: {
  if ($nick isop $chan) {
    if ($2 == $null) notice $nick You didn't specify who to ban
    elseif ($3 == $null) notice $nick You didn't supply how many minutes to ban $2
    else {
      /ban -ku $+ $calc($3 * 60) $chan $2 2 You will be unbanned in $3 minutes
    }
  }
}