The period for returning goods due to a defect after the contract

Question:
He says: If the buyer finds a defect in the goods that he did not know about at the time of the sale contract, one month after the date of the sale contract, is the sale valid? Is there a specific time limit?

Answer:
As long as he did not know, he has the option to return them, even if it is after one month, provided that he did not know. He has the option even after one month. However, if returning the goods becomes impossible, the price reduction (arsh) becomes fixed for him. If returning them is impossible because he consumed the goods or they decreased in value through use, returning them is impossible at that time, but the price reduction remains fixed for him. Yes.