It is a meaningless question, and one that has in the past made me wonder about just how truthful that people are being when they state the battery range that they are regularly achieving.
On one ride alone this year in the Swiss alps, I pretty much flattened the Bosch performance line's 400wh battery in ten miles, without even venturing into the sport or turbo setting.
I can do the same with little effort off road over here in 20 miles, and again without using the highest two power settings.
I weigh 75kg, and consider myself pretty fit, so the low range can only be attributed to riding terrain, bike type and bike set up. There are too many variables, for anyone to be able to quantify any meaningful and real world, across the board range calculation. It is not remotely possible, and I take many claims with a large pinch of salt.
The most that I have achieved though, was 675 miles. The bike was on the back of the car at the time.