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You can leave him at home providing you have a carer who will come in at least once a day to check all is well and feed and water your hamster. We have a pet sitter who comes in and sees to our hammies while we are away.
It can be stressful in a strange place but most hamsters adapt well enough to it. It may be better to look for somewhere that specifically boards small animals only or ask around if friends or relatives would look after him for you.