I bought the CS2 a few weeks ago and have already clocked up 87 miles on it.
My usual route is about 12 miles long, which includes a couple of very steep 2 mile long hills.
This route will exhaust the battery down to 1 bar as long as there isn't a headwind.
Another route I like is nearer 20 miles, but only has 1 hill at the end. My fault for choosing where I live in Wales.
So I guess in the real world 15-20 miles is about the expected duration.
The bike is fab. Well worth it. Previously I had a Coyote foldable electric bike from Halfords, which is also very good, but I do feel a little silly on it. This one I feel better about myself.
Not tried delimiting it, as there is no real need. I may one day change the gearing as I get less reliant on the power, and my knees get more used to the exercise.
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