We never had to wait more than 10 minutes for a bus during our last Pop Century visit, but we did have a huge wait at MK one evening after Spectromagic. I would say we waited a total of 30 mintues. It wasn't that there wasn't any buses...there was just too many people!! The line came out of the roped off area and was down past a whole other resort's area. This was in February! Considering how long the line was, I think Disney did a great job!