It looks like not all data access expires:

The following permissions do not expire:

• ads_read
• ads_management
• business_management
• configure_page_transactions
• pages_manage_ads
• pages_manage_cta
• pages_manage_instant_articles
• pages_manage_engagement
• pages_manage_metadata
• pages_manage_posts
• pages_messaging
• pages_read_engagement
• pages_read_user_content
• pages_show_list
• read_audience_network_insights
• read_insights

https://developers.facebook.com/docs/facebook-login/auth-vs-data/