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When using Multi-factor authentication in Office 365 something that is good to understand is how often you can expect to be prompted to enter the second factor.
Microsoft Office 365 session timeouts article below explains how this works in the Azure Active Directory with modern authentication section:
Session timeouts for Microsoft Office 365
When you successfully authenticate you will receive a access token and a refresh token to be able access Office 365 services . The access token is only valid for an hour and then the refresh token is used to obtain a new access token if the initial authentication is still valid.
The Refresh token is valid for 14 days but if you are continuously using your mailbox during this period it can last up to 90 days.
So it could be you are not asked for Multi-factor authentication again for up to 90 days in Outlook.
Things that could force you to re-authenticate:
How modern authentication works for Office 2013 and Office 2016 client apps
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