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It should only take 5-10 minutes, 15 max. I would still leave it on for much longer to be sure it isn't lagging. If you can, leaving it on for a few hours would definitely rule out lagging, although it is unlikely that this would be an issue.
!!!!!PLEASE READ!!!!!! Our Ukrainian friends are undergoing atrocities right now and need support. There are two things you can do for starters:
1.) Donate to one of various organizations offering medical, military, and psychological support to those impacted:
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2.) Combat misinformation on social media.
Also, please feel free to PM me if I have not replied again about your BIOS mod request after 5 days.