Welcome to the Microsoft Q&A Platform! Thank you for reaching out regarding your query on Azure Logic Apps Adaptive Card lifetime.
As per the documentation, there is no mention regarding the lifetime of the Adaptive card. The lifetime of an Adaptive Card sent to Microsoft Teams through an Azure Logic Apps workflow is not limited to a specific time period. Once the Adaptive Card is sent to Microsoft Teams, it will remain available in the chat history until it is deleted by a user.
Here's a link to the Microsoft documentation on Adaptive Cards in Microsoft Teams: https://docs.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/cards/cards-reference#adaptive-cards
I hope this helps! Let me know if you have any further questions.