In "Call of Duty: Modern Warfare 3" (MW3) Survival mode, the time it takes to reach Wave 22 can vary widely based on several factors, such as the player's skill level, strategy, chosen map, equipment, and the difficulty setting.
Generally, a game can take anywhere from 1 to 2 hours to reach Wave 22 if the player is playing efficiently and effectively managing resources. However, this is just an estimate, and actual times could differ based on in-game events and player performance. Advanced players using optimal strategies might reach that wave faster, while less experienced players could take longer.
It's important to be prepared for the increased difficulty as you progress through the waves, as the enemies become tougher and more numerous.