I think ANYTHING more than 5-10 minutes is a fantastic amount of time for BG's to last! But, 81 minutes is even better! We would all love for that to continue for a long time to come, I'm sure. I think about the families that were trying so hard to get there by park open but one or more members were really dragging their feet or kids were having mini meltdowns or whatever, what a pleasant surprise for them to arrive "late" at 8:45 or something and find out they can still get a boarding group! Obviously that only helps if the ride has a good day, but wow that would improve the mood quickly.