Robot Units Calualtion and Clarification

Hello Fellows, we are trying to understand what exactly is RGU’s constitute? do know that its robotic unit but we are not able to get actual calculation of how do we calculate. So below is the example.

Let say package says 5000 RGU’s assigned what exactly that means? are these hours or something else? How do we calculate at the end of the month how much we used?

If we assign one license to our VM assigned RGU’s i-e 5000 will be consumed by VM right? If Yes than Bot running on that machine that had a license would consume any RGU’s

Here’s some resources that might help.