If you have separate figures for 40pt wins and to-time wins, that would be even better.

I'd say that the majority end during or after turn 4. That includes to time and to score. 5 turns happens to a lesser degree, and 3 and 6 turn games have happened to me but are extreme outliers. Probably one 3-turn and two 6-turn games ever

I assume turns = rounds.

It averages four for me, but the game is normally decided by end of round 3 anyway.

Five or six rounds for me, but then, my list is goofy as hell.

I've only played in two tournaments, but four has been pretty standard for me so far. I have actually completed fully half of my games without them going to time limit, though.