Long time reader, first time poster. My father-in-law is planning on renting a wheelchair at the parks each day (he is worried about the amount of walking/standing required). Our plan is to arrive at rope drop, and hit one of the rides we didn't fast pass before getting a wheelchair. The Disney website warns that wheelchairs run out quickly. Any guesses (I know nothing is certain) on how late would be too late to still get a rental?