I've played 84. 68 in the first season (injured for 14) and 16 so far in the second. 12 minute quarters for all games.
12 if you want the most skill points and only aim to play 1-2 games a day then 12 is right for you. If you want to play shorter I'd suggest 6 minute quarters.
I've played 106 games in 2 seasons. Showsnhow much I've been injured. Only 43 games played this year.
Just purchase the game. I don't know about other countries, but in India, the game is available for a fairly good price, just Rs. 500 (approx. USD 10).