Legal Question in Real Estate Law in South Carolina

There is no particular period of time. It all depends on how the item ended up on the property in the first place. For example, it could have been stored there, lost or misplaced, or maybe it was loaned to the property owner, or the property owner was working on it, and so on. I do not know how the item got on the property in the first place and without knowing everything about the situation I can't advise you.

There are "abandoned property" laws that might apply and there is a process for seeking ownership. You should call an attorney who can ask the necessary questions to advise you.