We all used the in game timer provided by Dying Light.

My run ( player 1) starts at 24:18 and ends at 27:35 Here is my video proof:

Here is nathanviator (player 3 ) video proof (also using in game timer), his run starts at 2:23 and ends at 5:38 :

Here is blink ( player 2, also used the in game timer ) video proof: (his run starts at 0:29 and ends at 3:47 )