How can I create a high quality path tracing screenshot?

I found no possibility to create a high quality path tracing screenshot. After a while the rendering in the viewport looks pretty good. But when I create a screenshot with the screenshot tool the image is very noisy. Is there a way to set a value for the seconds which will be used when creating a screenshot with path tracing?

Best regrads, Andreas

I found the solution. There is a console command: r.HighresScreenshotDelay

how do i get rid of all noise in pathtracing?? i tried to change value in postprocessing rendering feature on path tracing settings but i cant go higher than 64. when i put a higher number it goes back to 64. i use UE 4.25.3