Just curious... was that park opening to the general public or early entry opening for on-site resort guests? We were also there that August and waited approx. 90 minutes for FJ at opening, but that was being there at general public opening. We only had one day for Uni on that particular trip so I had opted to not switch hotels and we just drove over from AKL for the day... something I really regretted as I stood there in that 90 minute line. First and last time doing that! Lol
ETA: IMO "scheduled return time" entry for these areas is a great idea. I'd much rather wait until a designated time knowing we'll ultimately have a more enjoyable experience with the crowds being at least somewhat limited in number.