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30in is 762000 microns of vacuum
The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.
About 2/3 its speed in a vacuum.
Vacuum forming is a simplified form of thermoforming. Thermoforming heats plastic to a certain temperature, and is put on a mold while applying a vacuum to the mold.
I don't see how the sucking capacity of a vacuum would be measured in units of length.