Snowdown Tokens available until when?

Heyo guys, I am currently at 1k Snowdown Tokens trying to hit 1,8k for that Prestige Edition Akali skin but I am wondering until when is it possible to acquire Snowdown Tokens. In the League Client, there is some details for that but it's not clear enough for me whether it's for Tokens from Missions or Tokens overall from single wins. Thanks for your help and Happy 2019!
Report as:
Offensive Spam Harassment Incorrect Board