Thanks for reaching out to us, AFAIK currently you can only increase the token time up to 28hr (max 1 day)
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We are getting Access Token followed by Authorise token from Azure AD for Microsoft Graph Application which consist (SMTP, POP, IMAP, email and openid), this Access token is short live (60-90) mins, we got an article on MSDN to increase the token expiration time https://learn.microsoft.com/en-us/azure/active-directory/develop/active-directory-configurable-token-lifetimes, using this article we can generate policy but these policy are not applying on token generated, as a requirement we need long live Access Token (more than 3 months), let me know if there is any way to get it.
Thanks for reaching out to us, AFAIK currently you can only increase the token time up to 28hr (max 1 day)