it sounds pretty normal to me he is 51/2 months they say they can hold it an hr for every month that they are. Like 3 months 3 hrs. and etc. I would entice drinking by putting some ice in his water and you can add water to his food as well.
Are you sure he is not sneaking and peeing in some secret spot.
My Pixie did this to me I thought she hadn't peed for 10 hrs when she was around 5 months and I found her secret spot so she was caught out!! lol
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