There will be 48 Happy Hours commencing December 25th @ 12:00 CET until December 27th @ 12:00 CET. CET is GMT + 1 hour

See here for help converting to your local time.

Remember to stop your unfinished torrents before the end of HH so that the tracker (which caches data) will properly credit you with the free portions that were already downloaded. I would do this 15 minutes before the end of the period.
You can restart them after Happy Hours have ended to finish them.

Be sure you set up your client to treat even slow downloads as active ones and always stop a torrent before you delete it from the client. If your client doesn't shut down properly or your computer crashes, be sure you wait at least one hour before you restart the client so the "ghost" sessions have timed out. And it's always best to check the site first after something like that happens so you can see what it thinks you're still downloading and/or seeding.

Please remember that the overseeding rules still apply even during HH.

Merry Christmas from Pedro and The Staff