Before it was all coding on its own, I asked a model for bugs in a new project, saved me the 15 minutes of new web project I waste every time trying to remember obscure first time setup things you dont touch for years in under a minute.

I suspect theres a lot of hours saved that are otherwise wasted by devs when some simple thing throws off their implementation completely. Basically we cant measure the saved developer hours by LLMs because it could be literally anything.