I was actually going to email suggesting this but Mariatta beat me to the subject. :)
For me, I think aiming for October 1st to get the initial proposals in is a good goal.
If it looks like people need some more time then that's fine and they can ask for it and we can all agree to extend it, but we first need to (a) get to October 1, and (b) people actually end up needing more time :) . As of right now no one has concretely said that October 1 won't work for them (it's actually October 1 specifically because Victor asked for that date so he could make a proposal due to his vacation in August). So for me, going forward with the goal of October 1 for people proposing governance models seems reasonable and we can re-assess as we get closer to that date.