Nsight Visual Studio Performance analysis for OpenGL events

I have been using Nsight to analyze the performance of an OpenGL application. I would really appreciate it if anyone could explain what GPU duration column under OpenGL draw calls and OpenGL frames exactly represents. Thanks in advance.

We recommend using Nsight Systems for Analysis/Trace/Timeline, since this functionality has been obsoleted in NsightVSE for over a year and is being removed in our upcoming release.

Note that this stand alone tool can be integrated into Visual Studio with
NVIDIA Nsight Integration.

I’m moving this query to Nsight Systems forum.