While at the MK this week end, my sister had trouble with her band at entry. A very nice CM took us to Guest Services to help. When she was done we only had less than 5 minutes to make it all the way to Frontierland for our first FP. She hand wrote a pass allowing us to FP any time on any one attraction. She also divulged a Disney secret I never knew. The actual FP window starts 5 minutes before the stated time and ends 15 minutes after the stated time. We tried it out at Space Mountain and she was right. We arrived at the FP entrance purposely 14 minutes after our last arrival time and got in.