Fifteen seconds is the threshold

The friction threshold

Nobody minds recording a full day in court. It is one entry, it is obviously billable, and it takes a moment.

The twelve-minute call is where systems die. If logging it involves opening something, finding the matter, choosing a category and typing a description, the entry costs a meaningful fraction of the work itself, and a rational person skips it. Multiply that across a practice and the missing revenue is substantial and entirely invisible, because nothing was ever recorded to be missing.

Same day, not same week

Friday reconstruction of a week's work is not recording, it is estimating. And it estimates low, consistently, because forgetting is not symmetrical. Nobody invents work they did not do. Everybody forgets work they did.

The gap between same-day capture and end-of-week reconstruction is the difference between a defensible fee note and a negotiation.

Let people write badly

Forcing a taxonomy at the moment of entry is the second most common way this fails. The person has thirty seconds between calls and is now being asked which of nine categories a piece of work belongs to.

Let them write a line in their own words. Categorise later, in bulk, by someone whose job that is. The record being untidy matters far less than the record existing.

The thing that actually changes behaviour

Show people the bill their time produced.

An associate who watches a fee note get queried and then defended, line by line, because the time record was there, stops experiencing time recording as surveillance. That single episode does more than any amount of insistence from a partner, and firms that never close this loop are the ones where the habit decays after a quarter.

Especially if you bill fixed fees

Fixed-fee work is where firms most often decide time recording is pointless, since the fee is agreed regardless. It is precisely where it matters most.

You are not recording the time in order to bill it. You are recording it to find out which fixed fees are profitable, and a firm that does not know is setting prices by instinct on the majority of its work.