I boat on Cape Cod that has a LOT of sand. I have run through sand a zillion times with no damage I wouldn't worry about it.
However, a couple of times were to the extreme and clogged the cooling system and I had to disassemble the hoses to clean them out. Not fun.
But really, unless you have vibration or your "engine overheating" alarm going off, don't worry, be happy.
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