We went the other day when there was about a 35 min wait. My DS really just wanted to play, so we were fine waiting that long. We ended up waiting in line (inside) for about 5-10 mins before we got a pager and then played for another 20-25. There were a lot of people in the tent. Enough that there were some rowdy 10ish year old boys who were running around playing tag and making me nervous that they were going to hurt my DS. (They were running up the slides and swinging all over the place). I kind of positioned myself in front of DS so they didn't hit him! I really wish parents didn't just let their kids run wild in places like that!
So just a word of warning! Yes the play area is GREAT and we love having a chance to let DS play, but sooner rather than later someone is going to end up really hurt!