kids really do dawdle!! I don't have any experience with school buses, but at the pool I swim our practise ends about 5 minutes after the kids' lessons. You see these kids (about 4-6years) just stand under the shower not doing anything while the mothers are at the side away from the spray pointing and shouting at them to do this and that. They still just stand there.

Sounds cute, but super annoying when you're standing there cold and chlorinated waiting for a kid to finally move on.