My 11mos pup plays and frolic outside when it comes time to poop?

I allow my pups six mos and 11 mos two hour play time and 3hours in their kennel until it is time to poo and wee, if they do not poo and wee then they must stay in the kennel until the next feeding,and if they do not poo or wee at all then they have to stay in until their curfew, is this okay or am I being to cruel, I have to consider a clean house and a peace of mind.