In OU, we have rating decay above 1400. Every day at 5 am EST:
If you played 6 or more games, there is no decay
If you played 1-5 games, you lose 1 point for every 100 points above 1400 you are
If you played 0 games, you lose 1 point and an additional 1 point for every 50 points above 1400 you are