I was surprised by the same thing. Is it a common time for meetings? Is there some cultural thing that happens exactly at 10am?
Not sure but I do have daily standups at 10am here in Sweden. It seems like a time when most people have had time to get to the office, but it still leaves a couple hours until lunch.
I have it on my TODO list to look a little more into that. It caught me by surprise when I pulled up the data for Germany.