How many hours between shifts — and whether the minimum is enough

The first time I properly looked at my rota with this in mind, I was not checking whether it was legal. I was checking whether I would survive it. Those turn out to be two completely different questions, and only one of them has a number attached to it.

Where I work, the gap between two shifts is not something anybody negotiates, because the scheduling system will not let it through. If a rota would leave too little rest between two shifts, it simply cannot be entered. The same goes for days off: every so often the rota has to give you one, and if it would not, the system blocks that too.

I have watched this work in practice. A supervisor can ask whether you would come in at a different hour than the one you are scheduled for — and if that change would break the rest period, the system refuses it. The company does not want that kind of exposure, so it does not happen. From a legal point of view there is simply no possibility of the gap being too short.

So if your rota comes out of a proper scheduling system, this is one of the few things you can stop worrying about entirely. I say that plainly because a lot of what you read online assumes the opposite. One caveat: not every workplace runs that way. If your rota is written by hand on a sheet of paper, check it yourself — I can only tell you how it works where I am.

Here is the honest part. The minimum the law gives you is often not enough. Not because the number on paper is wrong, but because shifts are not equal to each other.

Some shifts are light. You come in, do your thing, go home, and you are not really tired at all. After a shift like that, the same legal gap is more than plenty.

And some shifts take everything you have. You come out barely standing — the kind of day where you do not even feel like washing when you get home, you just want to lie down. After that one, the same number of hours is nowhere near enough, and you walk into the next shift already behind.

Part of the reason it varies so much is the nature of the work. On a production line, on a four-shift rotation, you are doing something repetitive: you stand there, you move things, you stack things, hour after hour. It is tiring, but it is predictable — you know roughly what a shift is going to cost you before you start it.

A shop floor does not work like that. One day runs steady, the next is a scramble. The delivery, the volume, what has to be done and how fast it has to happen — all of it changes constantly. So two shifts with identical hours on the rota can cost you wildly different amounts. You cannot plan your recovery around an average when there is no average.

Of all the shifts, nights take the most out of me, and it is not a close contest. I have written about them separately because they are their own problem with their own rules. But in the context of the gap between shifts, one thing is worth saying: after a block of nights the legal minimum is further from sufficient than at any other time.

• Do not audit the legal side if your rota comes from a system. It is handled, and far more strictly than people assume. Read your rota looking for the day off, not for the hour count.
• Judge the gap by the shift you just finished, not by the clock. A light shift and a shift that wrung you out do not need the same recovery, even though the law gives them exactly the same.
• Protect the sleep before anything else. Inside that gap, sleep is the only real lever you have — everything else is arranging the hours around it, which is what I do with those 12 to 16 hours.
• Assume a night costs more than the rota admits. Plan the days after it accordingly rather than being surprised every time.