Intended for a bot. When a nick is typed in the channel, the bot will /whois the nick, getting it's idle time. It will then output the message "NICK has been away for DURATION, try messaging them instead."

Screenshot:

on 1:TEXT:*:#: {
  if ($remove($1,$chr(58)) ison $chan) { set -u3 %whois.chan $chan | whoischeck $nick $remove($1,$chr(58)) }
  if ($remove($1,$chr(58)) !ison $chan) { halt }
}
alias whoischeck {
  if ([ % $+ [ $1 $+ [ .whois.ignore ] ] ] == on) { halt }
  set -u3 % $+ $remove($2,$chr(58)) $+ .whois on
  .whois $2 $2
  set -u15 % $+ $nick $+ .whois.ignore on
}
raw 317:*: {
  if ([ % $+ [ $2 $+ [ .whois ] ] ] == on) {
    if ($3 > 1799) { msg %whois.chan 3 $2 14has been away for 3{14- $duration($3) 14-3} $+ 14, try messaging them instead. }
  }
}