Playing 48 minutes is not officially supported by the game
The managers in this game are just that - managers - not coaches. Coaches do have a bit of free will...
I cannot say if that was done intentionally to prevent making 48 minute per player per match training reliable, but it does add a little bit of reality
This whole training system is not realistic
Currently we do not support it, intentionally, but that's not set in stone.
In the end, we decided that only things that affect the game in the extreme deserve such an approach.