The UK site 'dibbs' has a FP outlook page I watch and 60+4 is usually fine. FOP can fill up at 63 days, but 60+4 consistently shows afternoon/evening left. At minimum, you'll definitely see evening.
Days you are at AK, try looking for FPs one minute past the 11,1,3 & 5 o'clock hours.
I heard extra FPs get dumped into the system at those times. Worth a try!