If you had filled your back up and reserve slots in your roster with your starting line up you would have gotten 42 or 43 minutes per player, but that's the max for forfeited games.
Thanks for advice, i will play an other forfeit game this season ! ;)
Anyway, it's a little strange to me that the game engine decided to add lucky fans for playing this kind of match... In a normal match like a scrimmage for example, game engine don't add lucky fans when i decided to put only five players in my roster !!