I have had two very late interviews from schools that claim to still have spots open for direct acceptance. At both interviews we were told to expect to hear back from them shortly before May 15th. If I were to get in at both schools on or right before May 15th, how long would have have to choose one? Would I just accept the first offer, and then withdraw before accepting another? I'm not expecting this to happen, but I feel like I need to be prepared just in case.