I suspect there's considerable variance.

I believe the anecdotes in this thread range from about 1 month to 2 years, iirc. I've been feeling a little burnt out lately. But reading this thread reminded me of how much I have to be grateful for, and there were many good tips. Like focus on the positives. So for me, like 1 hour or so :)

There are many factors at play here.

How bad is it? What is the cause? How long does it take to address the cause? Ie if the cause is not having meaning, how long does it take to find something meaningful? If it is a bad community, how long does it take to find people you like?

Not my field, but:

* Suicide is one terminal option.

* There's a fair history of people who've suffered burnout, or equivalent earlier terms (nervous breakdown, nervous exhaustion, possibly also PTSD and its antecedants -- combat fatigue and shell shock), for the rest of their natural lives.

* Others who've taken multi-year / multi-decadal breaks, or transitioned to other careers or professions.

Again: I suspect considerable variance.

Another data point here - takes me about 6 months as well.

me too. 6 months is about how long it took me to recover from my own episode of burnout. I've spoken to several peers who report the same thing.