How Long Does It Take For a Rolling Shutter To Completely 'Roll'?

Any camera manufacturers around to answer this?

The question grew out of a discussion of the benefits of global vs rolling shutter in our License Plate Recognition Axis App Tested.

A rolling shutter does not expose the entire frame at once. It 'rolls' across pixels / rows. The question is: How much time does it take to 'roll' across an entire frame? Does it vary? Can it be speed up? What is the fastest it can roll?

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