Hi,
Welcome to Microsoft Q&A community forum!
Your subscription is good for up to 90 days, depending on your activity, and is renewable based on qualified developer activity. If you're using your subscription for development, it will be renewed regularly. You can find the expiration date, along with your subscription name, on your Microsoft 365 Developer Program dashboard.
If you're joining the program with your Visual Studio standard Professional or standard or monthly Enterprise subscription, your subscription is automatically renewed until your Visual Studio subscription expires.
The only way that you can extend your subscription is to engage in valid development activity. If you're not using your subscription to develop custom solutions, your subscription will expire and will eventually be deleted.
You have 30 days after your subscription expires to migrate any data. For the next 30 days, only the admin will have access to the subscription, and on day 60, the subscription and all data will be deleted.
ref link
https://learn.microsoft.com/en-us/office/developer-program/microsoft-365-developer-program-faq
Hope this helps
Cheers
Luca
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