How do you measure playback latency? Is there a way that an end user can do it as easily as measuring rountrip latency? Edit: clarification. Also, is there so

How do you measure playback latency? Is there a way that an end user can do it as easily as measuring rountrip latency? Edit: clarification. Also, is there some measurement being done to come up with the latency given in the following dialog? https://qjackctl.sourceforge.io/qjackctl-screenshots.html https://qjackctl.sourceforge.io/qjackctl-screenshots.html Or is that just the result of arithmetic for the given configuration options above it?