The bonus will begin this friday 25th at 1 p.m. ET and will last till the 1 p.m. ET on Monday 28th. This makes it a total of exactly 3 days i.e. 72 hours of the double XP boost.
The announcement followed after Treyarch unveiled a trailer for the Revolution DLC for the game which was announced earlier this month. The new content will soon come to the Xbox Live on January 29. The DLC will include new maps, a new game type and a new weapon. Release of the DLC on other platforms will follow shortly after its release on Xbox Live. In the past DLC for Call of Duty games have taken around a month to come to other platforms.