There are maybe 2 million people in Sydney, for example, so a 50km radius. A good portion of them (~100k cars) will head out at the start of a long weekend, in different directions, but along maybe 5 arterial roads. These split up again. While it's not "exact", think of it as a stream of cars which need charging. There are places to have breakfast, lunch, dinner, people will head out at different times and so on, but that gap is maybe 4 hours, so "lunch" maybe spread from 11-2.