How long do I have access to games within the Xbox Game Pass catalog?

I have just got an xbox live gold 12 monate kaufen recently, I'm confused about how long I can access. Can anyone tell me about this?
Patsy SticklesAsked:
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WadskiIT DirectorCommented:
You have bought Xbox Live for 12 months.  
With this you will be offered 2 Xbox One and 2 Xbox 360 free games a month but you have to "purchase" them for them to remain in your games catalogue.

This will not entitle you to access Game Pass.  You need a separate Game Pass Membership for that.  You can get a 2 weeks free Game Pass membership from Xbox.com

Any games that are part of Game Pass are in effect "rented" during the lifetime of your membership.
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