The maximum amount of stacking for Gold subscriptions is 36-months (costing $180), any more than that will be lost. I Recommend Stacking 2-Years of Xbox Live Gold Grounded 1.0 (Console, PC, Cloud) – September 27.Slime Rancher 2 - Early Access (Console, PC) – September 22.Beacon Pines (Console, PC) – September 22.Deathloop (Xbox Series X|S) – September 20.Metal: Hellsinger (PC and Xbox Series X|S) – September 15.Despot’s Game (Console and PC) – September 15.The Outer Wilds (Xbox Series X|S version) – September 15.Assassin's Creed Odyssey (Console and PC) – September 15.