Sorry to bother you guys with another question.

I understand that a player should play at least 35min to be able to improve his skills on a given match. What I was wondering now is whether the chance of improvement is exactly the same for a player who played the whole 90min to the one who played 35min of the match?

Thanks

Yes. You can check it for yourself: each 15 friendly matches there should be skill improvements for your players (with coaching level 10).