Boot Time: from push the start button to Log on screen

Hi Guys

Can i find the boottime? but not the whole boottime, just the boottime till the log on screen?

I already have "Microsoft-Windows-Diagnostics-Performance/Operational"; ID = 100. But I think this is the total boot time, so boot time + post boot, no? Or am i wrong?

I already searched the event viewer and the wmi-objects, but no luck so far..

Can anybody help me out please?

Thanks!

Greetings