narrowband control frequency?

[Shiggy]

Hi

One customer wanted to know if M800 controls narrowband closed loop at certain frequency.
Customer wanted to ensure the frequency (how frequent AFR changes from lean to rich and rich to lean)
is the same as stock ECU control.

How frequent M800 monitors narrowband voltage and calculates closed loop, then change fuel trim control?
If it depends on engine RPM, how it will be determined?