Around 50.
Do you have many brands/types of the same puzzles? Like six 3x3 and four 4x4 for example? If so, it doesn't help since your parents probably cant tell between different types.
I have 9 and a 1/3 of them are broken a qiyi thunderclap 4x4 that has a center that misaligned, a weilong gts that has a broken corner piece, and a ylm m with a broken center piece