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For your 5-month-old puppy, five hours is the max. For a puppy, spending time by himself is a difficult new experience to take on. In his early days, your puppy doesn't spend a second alone -- he has his mama and litter mates to pal around with. As he grows, he will be able to be more independent.
My guess is that should you ignore him he will hold it. A good rule of thumb to follow is a puppy can hold his urine 1 hour at one month, 2 hours at two months, 3 hours at 3 months, etc. One extra hour per month. I guess this could vary a bit but that is the guideline we were given when asked what to expect.