It's just a fun challenge that we like to do in the parks and there's no harm if it fails. The main point is that the lines are significantly shorter at night and things can be accomplished that can't be done in the morning, no matter how early you arrive.
Other successful challenges over the years have been:
7 Dwarfs Mine Train twice in 30 minutes (accomplished during opening week in 2014)
Space Mountain 4 times in 35 minutes (took a little bit of running to make the last ride)
Toy Story Mania 4 times in an hour (and still made it to Fantasmic on time)
Tower of Terror 13 times in 2 hours (won't be doing that one again)
I'm thinking about stretching the AK challenge to an hour, but I'm going to add a ride on Navi between the two rides on FoP. I think we can start at 9, get all of this done, then make it to the 10:30 RoL show on time.