It certainly depends on what I'm working on, but as the saying goes code is typically read a lot more than it is written and there are definitely days of bug finding and editing where you hit or dip below 10% in insert mode, spending much more of your time in other modes or navigation. I'm not sure my average day is 10%, the mean is probably more like somewhere between 25-40% when I was most heavily using Vim to write code.
I'm more often going to be in insert mode writing prose, but that is a different flow state. Also, even with prose it sometimes feels like you spend more time editing it than writing it.
I'm more often going to be in insert mode writing prose, but that is a different flow state. Also, even with prose it sometimes feels like you spend more time editing it than writing it.