How to find out how long the application was launched?

Question

Windows

How to find out how long the application was launched?
Is there a program?
After all, when I manually start the timer, large errors appear in

Windows 10. The program needs to count when the program starts, how much has passed before it is fully launched.

Answer 1

If it is possible, then 2 variables can be introduced into the program: 1 will save the windows time during program startup, and the second will save windows time after the program is fully launched, and the difference between the variables will be the program startup time.

Answer 2

With the "launch start" event, there are practically no questions. Let's say that the start of the launch is a user click on the program icon.
But what do you mean by the "completion of the launch" event is a big question.
Interface drawing? - so the interface can be drawn in parts for a long time. The program may be without an interface at all.
Loading used dlls is also not an indicator.
Be clear, maybe someone can answer your question.