If someone rents a part of their home to a daycare (run by an S Corporation of which the homeowner is a shareholder, if it matters) during school hours only, and the person has use of the whole home during non-school hours, should the days of the rental be counted as "Personal Use Days" (since the person has use of the rented space during some part of every day) or "Fair Rental Days" (since it is rented at a fair rate) on Schedule E?