50hrs is 3000mins so you'll have to play:
- 375 matches of 4min halves
- OR 300 matches of 5min halves
- OR 250 matches of 6min halves
A few seasons of Career mode for the relevant achievements should easily get you over a hundred games, another ~50 for winning in every stadium and you should be well on your way. Another 100 online ranked matches and trying for the Pro Clubs Cup achievement should get you over 3000mins of game time.