First, BoardWalk has two lots. The large main one in front of the resort and another fairly large overflow lot across a street. For that overflow lot there are no limitations as there is no gate or guard to go through. For the main lot, they do not put time limits; however, a sign outside says it is not to be used for a guest going to Epcot or MGM and they often ask at the gate to determine whether you are going to BoardWalk for the purpose of being at the boardwalk. They check more often and are far more circumspect about a person's intent if the person is trying to get in during the morning, when there are no boardwalk activities going on, rather than the evening when there are. In other words as long as you are going to Spoddles and then sticking around for BoardWalk activities and night life you will find there is no time limit.