With Continuous Access Evaluation, Apps that support it have a lifetime of up to 28 hours
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I want to ask if the Access token is still valid for 60 minutes or you have implemented the possibility to increase that time.
In this question (by January 2015), it wasn't possible:
Increase session timeout of app which is using Azure AD openid connect authentication
With Continuous Access Evaluation, Apps that support it have a lifetime of up to 28 hours