Yes, when there is a quick flash, attention starts to turn off. This is a defense mechanism of the psyche. There is an average speed for each view. Too slow is boring. Thoughts run ahead of the process and irritation and impatience appear .. If it is too fast, then the defense that I talked about works.
There is an approximate time for one picture if you are shooting a clip (for example). This is something like 5 seconds per picture. How to apply this to the drawing process ... this is where you have to experiment.
It's important to find the right pace here :)

These are just my thoughts, I could be wrong.