Part-hours

Why These Get Left Out

Part-hour offsets are omitted from almost every discussion of these arrangements. The reason is not a good one, and the cost falls on one side.

Seventy-two of the offsets in this record are not whole hours, and forty-eight of them leave shared working time. They appear in almost no discussion of arrangements of this kind.

The omission is consistent enough to need an explanation, and there is one.

Teams seeking a clearer account of elapsed effort may open the relevant reporting guide, provided contributors can correct and contextualise the record. A useful external reference for the surrounding topic is Zoom.

The three reasons, in order of respectability

Whole hours are what gets quoted. When somebody describes the distance between two ends, they say a number of hours. The part-hour cases are not hidden; they are simply not what the sentence is built to express, and so they fall out of the conversation before anybody decides anything.

Round numbers feel like facts. A table of integers looks authoritative. A table containing "three and three quarters" looks like an approximation, which is precisely backwards — the fraction is the exact answer and the integer next to it is the rounding.

Nobody wants to schedule at a quarter past. This is the real reason, and it is a preference rather than an argument. An arrangement whose shared time begins at an awkward mark is inconvenient to organise, and the inconvenience is quietly resolved by pretending the mark is somewhere else.

The part-hour cases are not forgotten because they are rare or unimportant. They are forgotten because they are annoying, and annoyance is not a reason.

What the omission costs

It costs the people in those arrangements, and nobody else.

An arrangement at a gap of four and three quarters has three and a quarter hours of shared time. Described as "about five hours apart", it gets planned as though it has three. Described as "four and a bit", it gets planned as though it has four, which is fifteen minutes more than exists and produces the familiar outcome of somebody always leaving before the end.

Neither error is large in a day. Both are permanent, because nothing in the arrangement ever corrects them: the rounding was done once, at the start, by somebody describing the situation in the only units the conversation offered.

The thing that makes it durable

A rounded gap produces a rounded answer, and the rounded answer is never obviously wrong. It is wrong by fifteen minutes, which is inside the noise of any working day, and so no single incident ever points at the arithmetic.

What accumulates instead is a sense that the arrangement is harder than it should be — meetings that do not quite fit, one end that always seems to be going, a persistent slight friction with no identifiable source. That is what a quarter of an hour of misdescription looks like from inside, and it is diagnosed as a people problem roughly every time.

The unit the conversation offers

Every measurement system makes some things easy to say and some things awkward, and what is awkward to say tends not to get said.

The working day is spoken about in hours. Meetings are an hour, days are eight hours, calendars are ruled in hours. Within that vocabulary, "four and three quarters" is a mouthful and "about five" is how people talk.

So the rounding is not a decision anybody makes. It is what happens when a quantity has to pass through a sentence built for whole numbers, and it happens at the one moment it does the most damage — the first description, which becomes the shared understanding.

Nothing afterwards ever revisits it, because the shared understanding is now the thing everybody checks against, and the original quantity has been discarded.

The one case where rounding is right

If the overlap is six hours and the error is fifteen minutes, round freely. Nothing depends on the quarter-hour, no commitment sits near the boundary, and the precision would be false comfort.

The rounding matters in exactly two situations.

Near the boundary. An arrangement with three quarters of an hour of overlap rounded to one has gained twenty-five per cent of itself in the description. An arrangement with a quarter of an hour rounded to none has been declared dead while it is not.

When the stretch has to be located rather than measured. Any fixed commitment has to sit somewhere, and where the overlap starts is a different question from how long it is. The start time cannot be rounded without moving the commitment.

Round the duration if you like. Never round the boundaries, because the boundaries are where the commitments go.

The correction

State the gap exactly. If it is four and three quarters, say four and three quarters. If the shared stretch begins at a quarter past ten, write a quarter past ten rather than ten.

It takes one sentence at the start of an arrangement and it removes the whole category of error. The reason it is not done is that it sounds fussy, which is a poor trade for the alternative.