The accuracy of your collected point depends on the solution your receiver gets. If it achieves a Fix solution, that means it has resolved any ambiguities in its calculations. With a Fix, you can usually get a centimeter-level accuracy, whether you collect the point instantly or average it over time.
Averaging just means the receiver takes multiple samples over a few seconds and calculates a mean value. This can help smooth out any tiny variations. Please note with a Fix solution, you’re already working with centimeter-level accuracy. So yes, even a point collected in 0 seconds can still be within 4 cm of accuracy, as long as the surveying conditions are good.
To obtain the best results, I recommend following our recommendations for the receiver placement and ensuring a stable corrections stream.