limit it to just those that are voiced, you can use $nick($chan,$nick,v).idle to return the idle time for $nick in $chan if they are voiced. This saves you from having to /whois all the time, thus eliminating this script from flooding you off of the server.
.idle returns a very different value than what appears if you do an extended /whois. Most servers let you send multiple nicks at once though using a standard /whois. I.E. /whois <nick1> [nick2] [nick3] etc.
