How to find out in which thousand seconds you started the game and finished? (Sorry, bad english, google translate)

I personally use the "Jump to time" plugin for VLC player. You can also use other programs like sony vegas for this. First I go to the frame where the screen goes from the menu to the game and use that as the start time. Then I will go to the frame when the camera moves from the opponent to the player and use that as the end time.

The total time is the end time - the start time.