Hello. I suggest we discuss this idea. There is a total (calendar) time spent on passing map. I suggest that you discuss the need to find time in the game when passing map. Only game time. Not calendar. I would use it for more objective comparison of the results of players.

Or is that?

Warzone already tracks 2 types of time per level:

Started this level = calendar time since starting the level
Session age = time that has advanced in the level (might be more than calendar time due to Time Warps)

You can unlock these with a level 2 Statistics advancement.

Thanks!