I'm kind of there right now.
I really needed a week off in December, and that got delayed 3 times by 3 months of crazy overtime, and something in me just broke. I finished the project but there were a few days in there where it took real fortitude to keep going and put myself in my desk chair.
I took a week and a half off, which wasn't anywhere close to enough after that, and after a couple of aimless weeks back, I quit my job and now I'm starting a new one and I set up a month off in between. I don't know that it's been quite enough, but it has helped immensely. I'm going to be taking at least a week off per quarter for better mental health maintenance.