A fortnight off rarely settles it. What shortens burnout, what keeps it long, and the order that sleep, humour, wanting and deciding come back in.

Most people take months to come out of burnout. Caught early, with something in your life really changing, it can be a few weeks to a few months. Once it has run for years, or the load stays exactly as it was, six months to a year or more is common.
That is the straight number. I cannot give you your own date, and I would be wary of anyone who offers one.
Recovery also runs unevenly. You get a few good days, you decide you are over it, and then a dip arrives that feels like starting again. The dip belongs to the recovery.
There is no fixed number of days, but I can tell you what a fortnight does, because I hear about it most weeks.
The first week off is usually the worst. People tell me they feel flat, tearful or short-tempered, they sleep badly, and they feel guilty about being at home. The tiredness lands once you stop, because adrenaline was carrying you and it has gone.
Somewhere in the second week the body settles. You get four good days, sometimes more. Then you go back, and within a week or two you are where you were.
The holiday worked as rest. You came back to the same work, done the same way.
A fortnight rests the body. The habit that wore it down walks back in with you on the Monday.
What changes the length most is whether the cause changes. If the workload, the staffing and the expectations are the same in November as they were in June, recovery has to push uphill. Where the load really shifts, even partly, things move faster.
The second thing is a pattern, and it is the one I work with. Saying yes before you have checked whether you can. Pushing on when you are empty. A working day that ends when the work does, however late that is.
Most people can trace it back to well before the job they have now. They learned it because it worked, and they were thanked for it.
If you are braced to be told this is your fault, here is what I see instead. The WHO describes burnout as an occupational phenomenon, the result of chronic workplace stress that has not been successfully managed.
It is not a medical condition, and the weight sits on the stress and how it was handled. The habit of overriding yourself is something you were rewarded for, and habits can be changed.
Rest matters, and a GP is worth seeing if you have physical symptoms or your mood has dropped very low. On its own, rest leaves the override untouched. People tell me they scrubbed the whole house in their week off, or lay on the sofa drafting emails in their head.
When I ask what they did with the fortnight, the answers are strikingly alike. They sorted the loft, answered the messages they swore they would leave, or sat through a film rehearsing Monday.
Nearly everyone expects to feel restored on the first morning back, and a few do, until about eleven o'clock, when the same heaviness arrives on schedule. People are often more upset by that than by the burnout itself, because they think the fix has failed. It had worked as far as it went.
It runs in three loose stages, and they overlap. First comes overdrive: you take on more, sleep less, and tell yourself it is temporary. Then the wearing down: constant tiredness, a short temper, a dry edge about work you used to care for. Then the flat stage, where you feel very little about anything and getting through the day takes everything you have.
Coming out runs roughly the other way, and I see the order every week. Sleep and appetite tend to return first. Then humour: people mention they laughed at something and it surprised them.
The last things back are wanting and deciding. Wanting to do something for its own sake, and making a small choice without dread. Those can lag weeks behind everything else.
If stopping feels like failing, you spend your time off half on duty, and the rest does not restore you.
This is also why one good week proves little. Energy comes back before the wanting does, and energy is what carries you straight back into the old habits.
Change what you can in the load, even a little, and rest properly. Then deal with the habit that keeps you running past empty, because that is the part rest leaves alone.
In the work, I take a detailed history and look for where running past empty began. Often it is years before the current job. Then I use clinical hypnotherapy on the pattern itself, so that rest starts to restore you and stopping stops feeling like failing.
I do not promise a timeline. The length depends on the load you return to as much as on the pattern, and I will tell you at the start which parts I can change and which sit outside the room. I see people at my practice near Maidstone, Kent, and online.