I'll put my money down. If LWers try the six hour meditation, they will turn out to progress about as fast as the general population, allowing for backgrounds in martial arts or any other meditationish practice.

I don't have any strong opinions about whether anyone will try it. I'm dubious about the value of starting with such a long session, but this is just based on an impression that meditation practice is normally started more gradually.

Wondering how one is doing compared to other people is an added challenge which probably isn't going to help.