If we ask the Pro drivers to make a Stop and Go it really is quite simple.
The stop can be taken on any lap except Lap 1, or the last lap. It requires that the driver enters the pit lane and stops his car alongside the pit buildings before moving off again. You only need to be stationary for a split second, provided the wheels stop rolling that is it.
There is NO pitlane speed limit and drivers are expected to drive to the far end of the pit lane before stopping, so that cars following into the pits can pull up behind before moving off. This prevents any overtaking in the pitlane and possible incidents ......in theory at least
If more than one stop is called for then they can be taken on any laps that you like except the first and last. The race post will make clear if that happens.