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What kind of paint did he use? If he used enamel it will probably have to be painted annually to maintain the shine. If he used polyurethane and you protect it (like in a garage) when not in use you could go 5 years. If he used 2 part epoxy paint it could go 10 years. Some paints are easily repaired, some aren't. Some can be polished when they start to dull. Find out what he used and read up on it. Be aware that some paints, like Interlux Brightsides Polyurethane aren't meant to be continuously immersed in water so if you slip or moor your boat you would want to remove that from the bottom and replace with a paint which would tolerate the water.