How long does it take to start Windows 7?

1. If you have a QQ housekeeper or a 360 security guard, how many times the opening speed is automatically prompted when the machine is turned on.
This data is fairly accurate, but sometimes I want to use the features that come with the system to view it.
2, right click on the computer, select management. Then in the pop-up computer management window, navigate to:
system tools → event viewer → Windows log → system
3, find the source of the eventLog.
As long as the source is this, it is all boot time, from here you can know when your computer has been turned on.