Is MW2 double XP real time or game time?

How to get and use Double XP in Modern Warfare 2

Call of Duty community frustrated over Modern Warfare double XP tokens - Dexerto

When is the next MW2 double XP weekend? - Prediction

CoD MW2 double XP weekend, free access start & end times

CoD MW2 & Warzone 2: Double XP Weekend Dates & Schedule

All Modern Warfare 2 Vault Edition owners will be getting double XP after all

When is the next Modern Warfare 2 double XP event

10 HOURS OF DOUBLE XP TOKENS WILL BE GIFTED TO ALL VAULT EDITION MW2 OWNERS! MW2 GIFTING DOUBLE XP

How to get and use Double XP in Modern Warfare 2