We haven't had cause to try charging mid-ride yet. Given that, even when we have been on a long tour, LEJOG being the longest, our daily average was about 50 miles, but the three shorter days in the middle meant that we were mostly riding between 55 and 60, I would regard that as an absolute maximum for us. If the battery does give us about 40 miles' worth of assistance, and it takes (allegedly) 4 hours or so for a full charge, a lunchtime top-up would get us the full day in.
We can, of course, ride without electrical assistance, which is fine if it's flat, and that's what we are used to with our Thorn tandem. However, given that the cut-out occurs between 15 and 16 mph, the machine gives the impression that, one you doing about 12mph, it is providing you with a lot less help than if you are stodging along at about 8 or 9 mph. I have far too little experience of it so far to see how this works out over a longer ride. Even then, I am certain that there will be day-to-day variation. Cold weather will lead to a less responsive battery than warm, and wet roads offer more resistance than dry - at least, to wide car tyres they do.
