Question: I announced that I wanted to stop the Charleston and another player said that I could only stop it if I had only 1 hand to play. Is this correct?

Answer: Stopping the Charleston after the first three moves is permitted and does not require another players’ permission to do so nor does that person need to give a reason as to why they make their decision. (See also ID22-Stopping the Charleston)

Source:  Mah Jongg Made Easy 2024 page 13, SECOND CHARLESTON, para. 1