Law firms may soon bill by the millisecond

For sixty years the billable hour has been sliced into tenths, the six-minute unit being the shortest span of professional attention anyone was willing to defend in writing. Under a proposal now circulating among practice-management consultants, firms that delegate research and first drafts to software would move to a unit measured in milliseconds, on the grounds that this is roughly how long the work would take.

The argument is framed as a matter of honesty. A client should not pay for six minutes of thought that took four hundred milliseconds. The counter-argument, raised in the same meeting, is that the client would then pay for four hundred milliseconds of drafting and nine hours of a partner deciding which four hundred milliseconds to run.

“The unit was never the point,” a partner attached to the review would be expected to say. “We have spent six decades pretending that judgement arrives in six-minute blocks. We are simply proposing to be inaccurate at a higher resolution.”

Invoices under the draft would arrive as timelines rather than lists. Clients could scrub through their own matter, watching costs accumulate in bursts, and would be offered a toggle marked show human hours only, which internal testing suggests would be the most used feature and the least discussed one.

Junior lawyers would present the harder problem. The six-minute unit has quietly funded the training of every generation of the profession, because somebody had to do the reading badly before doing it well. A billing model that prices the reading at nothing would remove the line item that pays for learning, without removing the need to learn.

Professional bodies would be expected to object, then to publish guidance, then to adopt it. One draft response reportedly suggests that firms should be required to disclose the proportion of any bill produced without human involvement — a rule that would be straightforward to write and, on current evidence, extremely entertaining to audit.

Nothing has been adopted. The roadmap remains a slide deck with a confident font. But the underlying question is already live in every firm that has watched a machine complete in a second a task it used to invoice as an afternoon, and has quietly kept invoicing the afternoon.