how to determine pc boot up time,
1. *Open Task Manager:*
Press `Ctrl + Shift + Esc` to open Task Manager.
2. *Navigate to the Startup Tab:*
Click on the `Startup` tab.
3. *Check Last BIOS Time:*
At the top-right corner, you will see the `Last BIOS time` which indicates the time taken by the BIOS during the last boot process.