i am constantly in tournaments where everyone but one finishes in a few days and the one takes 3 weeks per move and we never finish. I don't know of a way to prevent this from happening. Even setting the limit to 2 days seems to be circumvented by vacations.
Perhaps a tournament option to not allow vacations would work? ugh.

Perhaps when I retire I will have time to play 300. It would seem that there is diminishing returns after 100 or so, wouldn't you always have a move to make with 100 games going? I have never exceeded about 50 so I don't really know, but even at that level I was rarely left waiting to make a move.