As an off site visitor with just the option to reserve 30 days in advance I booked the soonest I could and that was totally not necessary. Do note that this was a low crowd time in September and that the only Disney theme park we were doing was the MK. I wanted to book FP+ for my three lines that would have the longest waits based on Touringplan.com projection. The truth was I could not get 7DMT, but my stand by wait at least is just projected to be 30 minutes (still longer than I want, but if only one ride is like that - OK). As for the other FP+ I did get -- I got them first and one time and then after playing with the plan more changed times and it was easy to get these again. Do note though morning times were gone right at the earliest point and later, but afternoon and evening were plentiful both times. I ended up booking FP for Winnie the Pooh and Peter Pan (on my touring plan, but there is no way we would wait for these, so the FP was perfect). All our other lines except 7DMT were listed at less than 15 minutes, so hardly worth a FP+. I did a second evening ride on Space Mountain just after dinner and used FP+ for that.