What are the most serve attempts for a single tennis point?

Question

In Tennis, you usually have 2 attempts for a service.

however under certain circumstances there are more serves made fot one single point, for example when the ball touches the net and then enters the correct T area or when an attempt is overruled by the hawk-eye.

What are the most attempts for one single point that have been recorded?

Answer 1

Here is a video of Serena Williams serving four lets on a single serve.