overgeeked
Open-World Sandbox
This might be of interest around here.
I don't do six-hour sessions, but I otherwise agree that fortnightly does free people up to have lives, and if you game on Saturdays, giving people half their Saturdays works really well for sustainability.This is why our group of 7 plays bi-weekly for 6 hours. Easier to commit because it gives more flexibility to work around other commitments in the future. "Can we take our vacation the other weekend?"
It doesn't always work, of course, but with a larger group being one player down isn't as incapacitating, especially if others take notes. And if it's the GM who is out, that gives an option for one of the other people to run a one-shot.