Hi @Tonich Phat ,
Thanks for the post.
According to the official documentation, the retention period of SharePoint Online is 93 days.
This image may make you easier to understand:
For more information you could refer to this article:
Learn about retention for SharePoint and OneDrive
In SharePoint in Microsoft 365, items are retained for 93 days from the time you delete them from their original location. They stay in the site Recycle Bin the entire time, unless someone deletes them from there or empties that Recycle Bin. In that case, the items go to the site collection Recycle Bin, where they stay for the remainder of the 93 days unless:
- the site collection Recycle Bin exceeds its quota and starts purging the oldest items
- the items are manually deleted by the site collection administrator from the site collection Recycle Bin
More information about: How long are deleted items kept in the Recycle Bin
I hope I can offer you a better experience next time if I have a chance to work with you again.
Yours faithfully,
Renjie Sun
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