When do you start the timer and end exactly? After you select the tribe and the first frame of the victory screen?

It looks like you start the timer after the map has loaded.

First of all thanks for being the first runner that's not me!

As for timing, I have been timing on the first frame I see the map while is fading in and the first frame that any part of the victory screen appears.

You are welcome :P I actually had been thinking of trying a speedrun of the game, since many of the modes to get stars play like speedruns XD