How late is too late to housebreak a puppy?

You are NOT supposed to put the dog's face in the mess it makes on the floor. A dog can only hold its bladder 1 hour for every month of age. So it's ridiculous for you to expect the dog to hold it. If he isn't let out during the day, how can you expect him to know where he's supposed to eliminate? See link for real expert advice on housetraining.