on *:TEXT:TDD:#: {
  set %response $nick $+ : Not here right now, try again later. <<Auto-message>>
  set %minimumsecwait 60
  if (%marker == $null) {
    set %marker $ctime
    msg # %response
  }
  elseif ($ctime >= $calc(%marker + %minimumsecwait)) {
    set %marker $ctime
    msg # %response
  }
}