Their is no ending time for the EFP even though it prints one. There is a start time. For example, I would take the family's tickets, and while they got some breakfast or stood in line, I would walk around the park collecting fastpasses for all fastpass rides, starting with Space Mountain (busiest ride). We would then liesurly go from ride to ride, and as we exited the ride, I would collect another fastpass. We could shop, eat, and relax as we went, never worrying about lines or expiring fastpasses. We even collected fastpass before we left the park for dinner, and then came back in the evening and they were still good. The EFP has special wording on the top to identify them. DL can have slow days when FPs are not neccessary, but during busy days they are well worth the investment. We went during spring break and never felt rushed and never waited more than 15minutes for a ride.