@jagten this is from their rules translated with google translate:

The optimum ratio "Download / Gave" is 1, that is, how many have downloaded - so much and gave (if you want to privilege, the optimal ratio are not less than 2.05). Strive for it if you want a long and serene life on our tracker: do not close your BitTorrent client as long as possible! Automatic system warns a user with local or global rating score (1 distribution) below 0.3 . If you were the only Sid (the owner of a full copy) on hand, please stay on the hand, even if your rating above 1 - Today you help someone, tomorrow it will help you.

from what i understand you should leave the torrent seeding for as long as you can, but if you have a global ratio above 0.3 is not a problem if you seed less or h&r.