The gap

Where The Arrangement Stops Existing

At a gap of eight hours two ordinary days share nothing, and at twelve they still share nothing. Ten of the twenty-five gaps are in this state.

Ten of the twenty-five whole-hour gaps in this record leave no shared working hour at all. That is the single most damaging figure here, and it belongs early rather than late.

The ten are the gaps of eight hours and more, in both directions. At eight the shared stretch has shrunk to nothing; at nine, ten, eleven and twelve it is still nothing, because there is no such thing as less than no overlap.

For a workflow with several handoffs, it is useful to open this practical guide and test one ordinary project rather than a polished demonstration. A useful external reference for the surrounding topic is OECD.

The end of the slope

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

Six gaps drawn; four of them leave nothing at all.

Past eight the reversed cell is the whole story: not less, not worse, the same nothing at every width.

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

The flat floor

The instinct is to treat a wider gap as a worse situation. On the measure this record uses, it is not. Two days with a gap of eight and two days with a gap of twelve are in identical positions: neither pair has a single hour in which both are at work.

This matters for how the problem is framed. Somebody whose arrangement sits at a gap of eleven sometimes reasons that getting to nine would help. It would not, on this measure. It would still be nothing. The only move that changes anything is a move to seven or below, and from eleven that is a four-hour move.

There is no partial credit below the floor. The arrangement either has a shared hour or it does not, and twenty-five per cent of the way to having one is worth exactly as much as none of the way.

What people do instead

When no hour is shared, the work does not stop; it changes shape. Everything becomes a handover. Questions are asked and answered a day apart. Decisions wait for a document rather than a conversation.

That is a real way to work and plenty of arrangements run on it successfully. It is simply not the thing people mean when they say an arrangement has overlap, and the distinction gets lost precisely because the gap is described as a number of hours rather than as a yes or a no.

The last hour

A gap of seven leaves exactly one shared hour, and it is the final one before the floor: one hour, entirely at one end of the day, with nothing on the other side of the middle. Sixteen o'clock to seventeen on the clock of the person who stayed, or nine to ten for a gap in the other direction.

One hour is not much. It is, however, categorically different from zero, because it supports a fixed daily meeting and zero does not. The step from seven to eight is numerically the same as every other step on the slope and practically the largest one in the record.

Gap	Shared
6	2
7	1
8	0
11	0

What the floor does to decisions

Below the floor, every improvement that is not a complete fix is worth nothing. That has a consequence that people in these arrangements reliably get wrong.

Somebody at a gap of eleven hours is offered the chance to move an end by two hours, to nine. They take it, because two hours is clearly better than none, and nothing changes: nine hours of gap leaves exactly what eleven did. The two hours were spent and nothing was bought.

The same two hours spent moving from a gap of six to a gap of four would have taken the shared time from two hours to four — a doubling. Identical effort, completely different result, and the difference is entirely about which side of the floor the arrangement started on.

This is the one place in the record where the advice is to do nothing. An arrangement at a gap of ten or more should either be fixed outright or left alone, and partial measures should be recognised as the waste they are.

How work reorganises itself below the floor

Arrangements with no shared hour do not stop functioning. They change character, and the change is consistent enough to describe.

Everything becomes a written artefact. A question asked at the end of one day is answered at the start of the next, which means it has to be asked in a form that anticipates its own answer: enough context, the options already considered, the decision framed so it can be made without a follow-up.

Decisions acquire a minimum latency of a day. Not an average of a day — a floor. Anything requiring two exchanges takes two days, and this is true regardless of how urgent it is or how quickly either person works.

The quality of writing starts to matter enormously. In an arrangement with overlap, a badly phrased question is repaired in thirty seconds of conversation. Here it costs a day.

Some work suits this and some does not. Work that is genuinely independent, with occasional synchronisation points, loses almost nothing. Work that requires continuous negotiation loses almost everything, and no amount of discipline recovers it.

Below the floor the question stops being how to get some overlap and becomes how to work without any. Those are different projects, and confusing them wastes the first six months.

Ten out of twenty-five

Four in ten of the whole-hour gaps leave nothing. Put the other way, three in five leave something — which is the more cheerful phrasing of the same fact and no more or less true.

Both numbers are on this site. The one that argues against the arrangement is on the front page.