I think overall there's a luck of the draw thing going on for FoP FPP: I've seen a lot of people say they had no problem at 60 days, and at least several like me who saw absolutely no FoP FPP at 60 (and I was online at 7AM and was the first FPP I went for.)
I was able to get the Na'vi river with no problems and they continue to be available. (My day is 7/31.)
However, over the weeks since my 60 day opened up, I kept the FPP booking page open on my desktop browser and checked it a few times each day - after a couple of weeks I saw a single set of 4 FoP FPP open up for my day at 1:30PM and I snagged it.
However, I'd like the FPP to be earlier, so I've continued to check and I've only seen 1 other set of FPP appear for much later in the day. I've also checked for single FPP most times as well just to see if I could get overlapping ones, but none of those either. (Hoping this doesn't foreshadow a wonderfully crowded AK day for us.)
Anyway, my takeaway: You can get FoP FPP if you don't get them at 60 days, but you will likely have to work for it. Good luck!