Try this:
Code:
on ^*:text:*:#:{
  var %text = $md5(# $cid $lower($strip($1-)))
  if $hget(repeats,%text) { halt }
  hadd -mu[color:red]60[/color] repeats %text 1
}

This ignores messages repeated within 60 seconds.

/.timerQ 1 0 echo /.timerQ 1 0 $timer(Q).com