on $*:TEXT:/^!(start|stop|info)$/iS:#:{
  var %c $regml(1),%s $($+(%,startime,.,$nick),2),%m msg # Timer For $nick has been
  if %c = start && !%s {
    set $+(%,startime,.,$nick) $ctime
    %m initiated
  }
  if %c = stop && %s {
    unset $+(%,startime,.,$nick)
    %m stopped at12 $duration($calc($ctime - %s))
  }
  if %c = info && !$($+(%,floodt,.,#),2) {
    inc -eu30 $+(%,floodt,.,#)
    msg # Created by Carlosrevilla. Special Thanks to Napa182 for his help. Get The snippet @ http://www.hawkee.com/snippet/7032/
  }
}

You could use hash table

on $*:TEXT:/^!(start|stop|info)$/iS:#:{
  var %c $regml(1),%s $hget(Crono,$nick),%m msg # Timer For $nick has been
  if %c = start && !%s {
    hadd -m Crono $nick $ctime
    %m initiated
  }
  if %c = stop && %s {
    hdel Crono $nick
    %m stopped at12 $duration($calc($ctime - %s))
  }
  if %c = info && !$hget(Crono,#) {
    hinc -mu30 Crono #
    msg # Created by Carlosrevilla. Special Thanks to Napa182 for his help. Get The snippet @ http://www.hawkee.com/snippet/7032/
  }
}