Earlier quoted context omitted.
I’m not a yard company but I’ve talked to the team that does my yard and they said (two of them) that they do 12-16 houses a day and each house takes about 30 minutes. Usually one is blowing the whole time while one mows and weedwhacks and then the second puts on a backpack. They have a long day from like 7am to 6pm. So my example certainly isn’t contrived. But it’s just one example and the only one I know.
If these teams start at 7am, they should be executed/shot without legal reprecussions if they start at 7am in most areas with gas bullshit. You've specified an 11 hour work window. If, between two people, they spend 50% of that day working with full-throttle leaf blowing, I'm very impressed with their efficiency. Getting around & blowing being that dominant a factor in the day is impressive. That's still 9 batteries…
I think the issue is that buying and managing 9 batteries is much harder than a tank of gas. Not that it’s impossible, but that’s not a realistic path for professionals. We need better batteries before this is a feasible replacement.
This is also just a two person company and they own their own business.