"I always tell people the rule of thumb is - the # of months + 1 is the max number of hours a puppy can hold their bladders until reliably house trained.
I agree that potty training is situational, just as all training is. The rule of thumb on 1hr per month is one I use as well but it's amazing how many think if the puppy sleeps thru the night once or 2x, it's okay, then are surprised when it comes up w/ a UTI.
I've got a "puppy preparation" document that is several pages long now that discusses a lot of this. I send it out along w/ my contract once the pups are ~7-10 days old, so I hope not to have those types of questions anymore unless for some reason they are a late comer to the litter. It's been well worth it as it addresses such things as visitation, diet, training, etc too. Worth a thought.
My puppies are potty trained at 8 weeks and they can hold it for an 8 hours night at 10 weeks. I instruct the new owners to take the puppy out in the middle of the night until the puppy is 10 weeks old and that does it.
