I would have said 0x to infinity-x. Some stuff I think it would be a good idea and waste a bunch of time and then give up and just write it myself. And like you say, there’s lots of stuff I would just never have done, basically any kind of front end for example, if I didn’t have an LLM to do it.
I also do mostly research or one-of script development, for which I find LLMs less useful, as I want simplicity and I want to understand exactly what is happening. The only time I find LLMs help really there is if there’s some part I can abstract away like writing and interface to an api or something.