And also:Puppies have a 45-minute bladder capacity at three weeks of age, 75-minute capacity at eight weeks, 90-minute capacity at twelve weeks and two-hour capacity at 18 weeks.
I like his Errorless Housetraining (I used his techniques with my pup and they worked great). A young pup can't hold it for many hours. It's not a mental thing; it's a physical thing. The pup just doesn't have that level of bladder control and won't until he's older. If the pup falls asleep right after you leave and stays asleep until you come back, then sure, the crate will be accident-free when you return, because body functions slow down while a pup's asleep and the pup won't feel the need to go. But if anything wakes the pup while you're gone -- noisy people or animals outside, the mail arriving, whatever -- the pup is quickly going to have to pee... and it has nowhere to go but in its crate.Usually, puppies urinate within half a minute of waking up from a nap and usually defecate within a couple of minutes of that.