Do you have fast boot enabled in Windows settings? I'd check that and see what it's set to. Try it both on and off and see if anything changes. Disconnect any peripherals you have as well, it's not impossible an external drive or something like that could affect how quickly your system boots. You could also try disabling Secure Boot in your BIOS settings. Technically you'll be more vulnerable to certain specific types of malware so you'll want to keep that in mind if you try that, but it could be worth a shot to at least see if it affects your boot times.
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