I've got mine set up to run 4 times a day. Thats for about a minute during the 2 peak hours (11 and 2), and less for just a light shower right when the lights come on and about an hour before the lights go off. The cage has time to dry out before the lights go down though. This is along with dripper running for a good part of the day. Needless to say...Garrett is very well hydrated, lol.
Oh, and yes Mark, in my opinion with a mister running it is almost required to fabricate some sort of drainage. Mine was super cheap and works great. I actully had the parts laying around, but it wouldn't have been over 5 bucks either way. But I tried it without a drainage system before I even got the mister and woke up to water all over the stand one morning. Not good. It's definitely something to consider.
Thanks for all the feedback everyone!