Having read all that, I figured it's a good time to try it out myself. I've got an older PC, with 1GB of RAM, and it has Win-7 and Win-8 installed.
I will time how long it takes to turn the computer on, and get to my desktop. ....
Win 8
- From turning on the power to getting to the screen asking me which version of Windows I want to load, 34 seconds.
- To get from there to the "pretty background photo with a large clock at bottom-left", 6 seconds
- To get from there to the login screen, 1/4 second, or less...
- To log on after typing in my password.... 6 seconds
- To get to the desktop.... 1/4 second, or less
Total time from power on to desktop: 46 seconds.
Win 7
I started to try the same thing for...