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We’re getting into the nitty-gritty of how long Google stores internal communications before auto-deleting them.

Google’s 2020 Chat Retention Policy says in black and white (and Lopez has confirmed) that chats are permanently deleted after these amounts of time:

24 hours if chat history is turned off

Otherwise: 30 days for one-on-ones

18 months for chats in a threaded room (though apparently Google planned to change this back to 30 days in 1H 2021).