Doesn’t matter. The reality on the ground is that it’s zero minutes and zero miles out of your way. If you don’t like Hamburg, then pick any of the other four superchargers directly on your route. You sound like a person standing on a corner with a gas can in hand, wondering why you ran out of gas and there’s nowhere to fill up, while in actuality there are several gas stations in sight.
Claiming that your ignorance is the same as there being no way to accomplish what you want is bizarre. Look at a map. You don’t even need to get clever or go out of your way. There’s charging available all over the place. And the car will take you right there.
You don’t need a charge from the rental place. There are superchargers right outside the airport. You don’t need a trip anywhere close to optimum. With your destination about 100 miles away, you don’t need to charge at all in good conditions, and just a few minutes if things don’t go well. The range of a Tesla would often mean you don’t need to charge at all.
I really don’t know what you’re talking about at all. The scenario you describe is pretty much trivial, and you’re turning it into a big problem. You’re effectively driving right on by a bunch of gas stations and blaming the car when you run out of gas. Well, you say, they didn’t look like the gas stations I’m used to.
-IGU-