Actually I first rode about 8km from my place to the train station, and 56km is from the train's destination back to my place.
I'm a bit over 100kg so no way I did that on a single charge.
Yes it is a 680Wh. We stopped after about 21km for lunch in a place we knew we could charge our batteries, and I used a 5A charger, so by the time it took us to eat, my wheel was fully charged.
I rode a lot of the remaining way at the limit before the 3 beeps which is 23km/h according to Gotway App, which means about 20Km/h IRL.
I'll try to make a video soon, it was one of the best rides I've had in the area.