Tank and sump turnover rate

[MitchM]

I'm on the lower end of the scale, 2X turnover.
I don't understand why people are talking about dwell time in a skimmer and sump turnover rate. They're 2 different things aren't they?

Turnover rate is what your sump return pump is running at and dwell time has to do with the height and water throughput of your protein skimmer. Correct me if I'm wrong.

I prefer as low of a sump turnover rate as possible, while maintaining healthy water parameters in the display tank. I actively feed my corals and don't like the idea of having the food filtered out soon after I add it.
I keep on top of the tank parameters by measuring phosphorus and nitrate levels, weekly for now.