Let's are extremely rare in Table Tennis and you really shouldn't worry about it But just for the beneficial feeling of helping somebody I'm pretty sure there are infanite Just like tennis>
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There are no limits to the amount of lets that you serve. As long as the served ball hits the net and bounces into the correct service box it's a let. Then depending on if the let was on your first serve or second serve, you take two more serves or one more serve respectively.
There isn't a limit on lets in table tennis. There are also no penalties for lets in table tennis.
A player can let as many times as he wants.