It's timer starts when you press the power button and ends when your wallpaper and taskbar are visible.
Let's see that recording of a 3-4 second cold boot because you have these guys beat by a full second.
[video]https://www.pcgamer.com/this-windows-10-pc-has-an-insanely-fast-boot-time-of-just-49-seconds/[/video]
That's insanely fast. I'm about 25 sec to password screen.