I have same bike as you. I did a 30 mile ride this weekend. Terrain is mostly flat, 11th gear as much as possible on turbo. I was intentionally trying to run my battery down. I am 6'0 350lb and certainly not wearing cycling clothes. I got back with enough battery.. I had a lot of range anxiety when I bought the bike because of my size. It appears to be a lot of worrying about nothing. I was running mission control to try and capture data so I could figure out max range in those conditions. It seems to have stopped though at 20.77 miles, I did not think that shutting off the battery would end the workout on the app I would think as long as the app is running it would be able to resume. We stopped for a break and I powered down to conserver battery. So keep that in mind if your on a long cycle and make a pit stop. I'll post the stats from the app. I bought my wife a Como 5.0 Stepthrough also but I think she was using apple health only to track on her watch. I will have to check. Maybe she has data as well. She is not a large woman so her stats would probably be more real world for many riders rather than the stats of an Ape like me.
As you can see from stats below though if I kept it in eco or sports I could probably easily get 50+ miles out of a battery charge. My butt on a saddle would give out long before the battery did.
Distance 20.77mi
Duration 1:34:08
Avg Speed 13.24
Min Elevation 784ft
Maximum Elevation 859Ft
Elevation gained 314ft
Elevation lost 314ft
Max speed 25.99
Calories 334.88Kcal
Total Consumption 346wh
Average support level 350.82%