The longest that sperm can survive in a fertile (egg-white) cervical fluid is five days. Sperm exposed to room air on clothing, bed linens or toilet seats lose motility (the ability to swim) rapidly and die within less than one hour. Once the semen dries out, the sperm is dead and cannot fertilize the egg.
Was in town and got a room down the road. Paid my eight bucks and it was good for twelve hours. First time I went upstairs.