What are the technical details behind Motion Frequency?

I searched, but could not find any answer. I've used Blue Iris, a standalone software that you plug cameras into and they had a setting where you could configure how many frequently motion events would be recorded. For example, you could configure it so that it doesn't notify/record triggered events more than once every 15 minutes. This is useful if you don't want to get spammed or fill up your hard drive on a day where it's windy and the movement of leaves triggers your camera.I suspect this Motion Frequency setting serves the same purpose. However, I'm not able to find the technical details behind it. "Frequently", "Regularly", and "Periodically" are all subjective terms. I walked outside to pick up a package at my front door and, while the delivery person triggered my camera, I did not. It had been about 20 minutes. Thus, I'm left wondering if I need to adjust my sensitivity settings or if my Motion Frequency just isn't frequent enough. Without knowing what the actually interval is, I'm now left having to spend an afternoon doing test runs to determine the frequency in terms of minutes.Thank you for any feedback you can provide.