Very rarely, but it depends on the domain and/or the part of the code I'm writing.

For context, I mostly write GUI apps using `iced` which is inspired by Elm, so the separation between reading and writing state is front and center and makes it easy for me to avoid a whole set of issues.

I'm a hobbiest, so I only write in it 4 times a week, but I only run into borrow checker issues when I refactor large portions of existing code.

Maybe once or twice a month I'll get some language issue (like no negative trait bounds, restrictions on generic const, or something related to lifetime). I might spend an hour or more on each such case.