Repair installs rarely ever help or work. Usually if the problem is bad enough to NEED it, it just doesn't work.
ANY kind of installation should NEVER take more than a hour, at most. Maybe two on a very slow system.
Unfortunately you may be looking at the loss of the whole OS and the need to do a clean install. You do have a backup of any important files that were on that partition, yes? If not, well, this might be a learning experience. If you do, then that is a good thing and you could likely move directly on to doing a clean install.
If you are looking for the Windows 11 Clean install tutorial, you can find that here: Windows 11 Clean install tutorial (Click here) Otherwise, welcome to the Windows 10 Clean install tutorial This tutorial is intended to help you, step by step, to perform a clean install of Windows...
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