That's not a bad spec really. It ought not take ages, with new build etc etc.
Which bit of the boot is slow? Reaching the first BIOS screen, reaching the Windows login or after you've logged in?
Did it take as long when the build was fresh, i.e. before you loaded any apps? Does a Safe Boot take ages?
Does it perform OK once it's up and running?
Did replacing the hard drive with SSD make any discernible difference?
You haven't got something plugged into the USB when booting have you?
If you have done a clean install it could be worth checking whether there are any Windows 10 drivers for your specific machine on the Lenovo site. if you've not already Windows will use generic drivers which are not always the best (though in my case they seem as good as anything).
You could try using the performance monitor to see what's busy,. Sometimes it will show you which process is e.g. using 100% CPU - but you obviously can't see that during boot.
We could also get onto looking at the system logs but check the above first.
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