Well, the idle prop in $nick ($nick($chan,$nick).idle) will only work for channels both of you are on, and a who returns a channel that they are on. I was hoping it would return the channel they were most recently active on, but thats just not the case. So the most accurate idle time I could get using that would have to check each channel your on to see if they're on it aswell and, if so, check it across all the other channels and find the smallest one. It wouldnt be completely accurate depending on channels you don't see though.