alias recurring_timer_name { return test }
alias reminder {
  msg $1 %name get ready, Mercs will be up in 15 seconds.
  .timereventalert off
  unset %name
}

on *:text:!mercs:#:{ msg # $duration($timer($recurring_timer_name).secs) until mercs. }
on *:text:!mercalert:#:{
  .timereventalert 1 $calc($timer($recurring_timer_name).secs - 15) reminder #
  msg # I'll let you know when it's 15 seconds away.
  set %name $nick
}