Varies by the individual and their tolerance for nonsense. Here in Cook county(IL) if rent is not paid by the fifth, you are served a five day demand for rent, if not paid within a full 5 days after that, you can then be taken to court. So, it varies based on the person you are renting from, or planning on renting from. It is a lot easier for a landlord to stick to the letter of the law and follow the process to a T from the beginning. If not the judge says why didn't you do this, or why did you wait so long, and that tends to favor the delinquent party.