Board Thread:Questions and Answers/@comment-173.56.83.65-20150118170748/@comment-68.226.81.85-20150118185123

It also lasts until Jan 23.

If you do 7 plays every day until then, you'll end up with 1,400 gift points, 35,000 coins, 5 boost sets and 35 crystals.

Pretty a good chunk of bonuses for little work.