The Unit, and What It Rounds
Six minutes, fifteen minutes or half an hour. The recording unit decides how much of a day is rounding, and the direction is not neutral.
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- The entry
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- Analysis
Time is recorded in units: tenths of an hour, quarters, or halves. Every task that does not land on a boundary rounds, and rounding under any kind of pressure does not go both ways equally.
The record described in “The Unit, and What It Rounds” should be created while the work is still clear rather than reconstructed at the end of the week. Used for download time tracking software, review this official Monitask page can supply project-linked time context, provided people can review and correct entries before those records support billing or management decisions.
The unit is a choice, it is rarely revisited, and it decides what share of a bill is arithmetic rather than observation.
Teams documenting “The Unit, and What It Rounds” may find ILO working-time resources useful as an external benchmark. Record which parts apply to the real workflow and which do not.
Where the six-minute unit came from
Hourly billing in the professions, where a client is invoiced per unit and the precision is contractual rather than descriptive.
- Six minutes — most entries, most rounding, finest apparent precision.
- Fifteen minutes — fewer entries, more rounding each.
- Half an hour — tasks get grouped, and the per-task rounding disappears.
It spread to firms that do not bill that way and brought its arithmetic with it.
What rounding costs in a day
Forty entries, each rounded up by an average of two minutes, is eighty minutes. Against a seven-hour day that is nearly a fifth of an hour per hour worked.
Nobody intends it and no single entry is wrong.
Why larger units round less
Because they produce fewer entries. A half-hour unit forces grouping, and grouping removes the per-task rounding entirely.
Counter-intuitive, and it is why coarse units often produce more accurate days.
The two-minute call
Charged at a tenth of an hour, the client pays for six minutes. Charged at a quarter, fifteen.
Short calls are where the unit is most visible to a client, and where a firm's choice reads most clearly as a policy.
The client's experience of the unit
They cannot see it. What they see is a column of 0.2s and 0.3s whose regularity suggests measurement rather than rounding.
A bill of forty entries all at 0.2 or 0.3 looks precise and is almost entirely rounding.
What precision to report
Matching the reporting to the method. Hours to one decimal from tenth-of-an-hour recording is honest; to two decimals is not.
Totals should not imply an accuracy the unit cannot support.
The minimum charge
Some firms apply a floor — nothing under a tenth, or a quarter for any call. It is defensible when stated and resented when discovered.
Like everything else in this section, it belongs in the engagement letter rather than in the bill.
Choosing the unit
One question: what does our billing actually require? Where the client is not invoiced per unit, a finer unit buys nothing and costs administration.
Most firms have never asked, and the answer is usually coarser than what is in use.
Changing it
Changing the unit changes the totals, so it has to be announced rather than implemented quietly.
The announcement is easier than it sounds: a coarser unit with honest grouping is usually a better deal for the client and can be presented as one.
The timer
Software that records actual elapsed time removes rounding entirely for anybody who uses it.
Adoption is the problem, not the technology, and partial adoption makes the data inconsistent in a way that is worse than consistent rounding.
What the unit does not fix
Under-recording. A person who forgets to record a call records nothing at any unit.
The unit governs the precision of what is captured; the daily habit governs how much is captured at all.
What the unit does to short work
A profession whose work is mostly long tasks is barely affected by the unit. One whose work is mostly calls and emails is affected a great deal.
Advisory practices with high interruption rates have the largest rounding component and almost never measure it.
Measuring it once
Compare recorded durations against elapsed time for one person for one week, using a timer.
The difference is the rounding component for that pattern of work. It is a one-week exercise and the answer is usually between two and five per cent.
Why that figure matters
Because it is the same size as the margins firms argue about, and because it sits inside every estimate built from recorded hours.
A firm estimating from recorded time is estimating from time that includes its own rounding, and then wondering why matters come in above.
The unit and the client's rules
Some billing guidelines specify a maximum unit, usually a tenth of an hour, and some prohibit minimum charges outright.
Where they do, the firm's internal practice has to match or every bill to that client carries a systematic excess that an audit will find.
The decision, once
What unit does our billing require, what minimum do we apply, and is either of those in the engagement letter?
Three questions, asked once, and then not revisited for years.
The practical position
Use the coarsest unit the billing requires, group honestly within it, report at the precision the unit supports, and put any minimum charge in the engagement letter.