Prison or Elders. They played over an hour and wasted all the time with no rewards. I think the idea is good, but I just I don't like that system.
For example I would be afraid to start a game at 10 PM expecting to finish it by midnight to go to bed. I would end up either staying up too late (and maybe still not finish it) or just get out and let the fire team down. Both are bad. Bad. Bad Bad.
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They haven't revealed how the reward system works, but yeah, this is a concern. The level 32 version shouldn't be too bad but 5 waves still has the potential to be quite a long run. People rage quit after one RTO on a Nightfall, so it'll be interesting to see how the community reacts.