Thread:TalkingBird/@comment-31632130-20161201153020/@comment-30357300-20161202194136

I've found out:

The Christmas 2016 Timed Challenges are the second of 2 events added to the game by the Magic Tour and Christmas Update. This update was released on the 3rd of November 2016 for iOS players, the 5th of November 2016 for Android players, the 16th of November 2016 for Facebook players, the 18th of November 2016 for Windows players, the 20th of November 2016 for Kindle players and the 21st of November 2016 for Mac players.