Shapes

Why Three Of The Five Behave Identically

Early, standard and late are one eight-hour block in three positions. The offset they carry between them behaves exactly like a gap.

Early runs eight to four. Standard runs nine to five. Late runs ten to six. They are one shape in three positions, and the arithmetic treats them accordingly: pair any two of them and the answer is the one law, applied to the gap plus whatever offset the two shapes already carry between them.

Which sounds like a reason to ignore the distinction, and is the opposite.

A fair trial begins when the team can see the platform in context, understand every active setting and agree how exceptions will be discussed. A useful external reference for the surrounding topic is Atlassian.

What two hours of habit cost, read as gap

outlined: the day where the person is
hatched: the other end
solid: the hours they share
a reversed cell counts none

Three gaps drawn.

An early day against a late one at no clock gap sits on the third row of this drawing. The two hours are in the diary, not on the clock.

Computed from the gap. The working day is a stated convention, not a measurement; everything else here is arithmetic.

The offset is free, and it is not free

Put a person on early hours at one end and a person on late hours at the other, with no gap between their clocks at all, and they share six hours rather than eight. The two-hour difference between the shapes has done exactly what a two-hour gap would have done.

Pairing	Shared at no gap	First gap leaving nothing
early with early	8	8
early with standard	7	7
early with late	6	6
standard with late	7	7
late with late	8	8

Read the right-hand column. A pair on identical hours survives to a gap of seven. A pair two shapes apart gives out at five. The hours people keep are a gap, whether or not anybody calls them one.

There is no difference between being two hours apart on the clock and being two hours apart in habit. The arithmetic cannot tell them apart and neither can the working day.

Why this is the most useful page in the section

Almost every discussion of these arrangements treats the clock difference as the problem and the working hours as a detail. The table above says they are the same quantity, and that the second one is usually easier to change.

Somebody at a gap of four hours who keeps early hours while the other end keeps late ones is effectively at six. Moving to standard at both ends — a change of one hour each, within a single working day, requiring nobody to get up at a strange time — recovers two hours of overlap. That is the same gain as closing two hours of clock difference, which cannot be done at all.

How a habit gap forms

Nobody chooses to be two hours apart in working habits. It accumulates.

One end hires somebody who prefers to start early and finish early, because that was never a question anybody asked at interview. The other end has a culture of arriving at ten, which nobody has ever written down and everybody follows. Three years later the two ends are two hours apart in habit, every individual decision that produced it was reasonable, and the arrangement has a two-hour gap that nothing on any clock accounts for.

The difference from a clock gap is that nobody describes it as a gap. The clock difference is a fact about the world that gets stated at the start of every conversation. The habit difference is a set of individual preferences, discussed as such if at all, and never added up.

Why it does not get noticed

Because each end's hours look normal from inside it.

A person starting at eight and finishing at four is keeping an entirely ordinary working day. So is a person starting at ten and finishing at six. Neither has done anything unusual, and neither would describe themselves as having chosen an unusual schedule.

The two hours only exist in the relationship between them, and relationships between working days are not something anybody is in the habit of inspecting. The gap on the clock gets inspected because it is unavoidable; this one does not, because it can be ignored indefinitely without any single day going obviously wrong.

A two-hour difference of habit is invisible from both ends and visible only from above, which is the one vantage point nobody in the arrangement occupies.

How to find it in five minutes

Ask both ends what time they actually start and finish. Not what their contract says, not what the office opens at — what hours they are at their desk on an ordinary day.

Convert both to a single clock. The difference between the two start times, minus the clock gap, is the habit gap. If it is zero, there is nothing to recover. If it is one or two hours, that is the cheapest overlap available anywhere in this record, and the only thing standing between an arrangement and it is a conversation that has not happened.

Where the equivalence stops

It stops at the edges of the day. Shifting a shape is only free as long as the shifted hours remain hours somebody can work. Moving from standard to early is a one-hour change; moving from standard to five hours earlier is not a shape in this record and would not be a working day for most people.

The record contains three positions, spanning two hours. That is deliberately a narrow range, because it is the range within which the change costs nothing but habit. Wider changes exist and they are a different kind of decision.

What the three shapes do not do

They do not break the one law. Three identical-length blocks against each other produce the same straight slope as any other equal pair: one hour lost per hour of total separation, down to a floor.

Everything in this record that behaves strangely comes from the other two shapes, and those are next.