Speed Ramping Trick

In this video at 1:39, How do you achieve this effect? Is there a formula, for instance every 3 seconds you can move so far or do you just wing it until you get it right?

 
This is stop motion photography with humans, so the various animation formulas would be appropriate. I've had a book on the subject for some time... but alas the time to experiment never seems to be available...

The blurred motion of the moving people would indicate a very slow shutter speed, in addition to the 'mime' freezing for each frame.
 
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