Unless it was modified there is a default 10 day period to rollback.
This feature uses windows.old.
By default Windows.old is deleted after 10 days and will increase drive free space.
This can be modified before the 10th day in case you want more time to troubleshoot upgrade problems.
See this link to modify / extend the 10 day default rollback period:
https://www.tenforums.com/tutorials/111315-set-number-days-can-go-back-previous-version-windows.html
See this link to rollback:
https://www.tenforums.com/tutorials/4097-go-back-previous-version-windows-windows-10-a.html
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