It depends on the park, but my family often does over 10 FPs in 3 hours in Magic Kingdom (our record is 14 FPs between 9-noon). We pre-book only one FP and then grab what is available once you tap into the next ride. It's kind of like FP bingo. And there is not much competition for day-of FPs in the early morning.
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I was sold on CLFP until I found out you cannot overlap them. Now I'm not so certain. Even if you use your first three "regular" FPs, it would be hard/impossible to pull a 4th day-of FP without overlapping the 3 CLFPs.
How do people best maximize FP use beyond the 6 FPs?
I believe you, which is why I was a little hesitant to post my experience. I too have done more than one FP per hour, but it REALLY depends which FP you want, and how busy the park is.
If/when my goal is to do the maximum number of FP then my ride choices are going to be different choices than what we chose.
I'm not sure how to characterize our goals for this trip this in this space, but here goes:
If we see that BTMRR has a short wait, we'll absolutely ride it five times in a row. But we knew Easter 2018 wasn't going to be that way. More or less, our options for riding BTMRR were: FP, after midnight, or FP. Almost the only way to get a FP for any of the MK Mtns was to book it at 60 days.
So for us, having the extra FP meant more e-rides than we'd normally get to ride over the very crowded Easter week. Our choices in MK were: Space Mtn, BTMRR, 7D, Splash, PotC, P Pan, and HM.
Mid afternoon, the standby wait for Splash exceeded three hours! The queue for the Haunted Mansion snaked down by the water in way we'd never seen before! So we were really happy we had a FP for those.
But then, I should also add that we didn't wait long for the carousel, Peoplemover, or Philarmagic.
We also managed a few extra FP, and we even had a few FP options. Even with our limited options, we sometimes chose our preferred FP attraction over getting the highest number of FP.