Most law firms bill in six-minute (0.1 hour) increments, so a two-minute email and a six-minute one cost the same. That's normal on a single task. It compounds when a lot of short tasks land on one invoice — eight brief touches on a matter can bill as nearly an hour of real work. Ask whether your firm groups same-day, same-matter tasks before rounding, or rounds each one independently.
Most law firms bill in six-minute increments. A full hour gets split into ten units of 0.1, and every task on your invoice gets rounded up to the nearest one. This isn't a trick — it's a standard way of tracking time, and plenty of firms disclose it in their engagement letter.
The part worth understanding is what "rounded up" actually does to a bill made of dozens of short tasks.
What rounding up looks like on paper
A two-minute email reply doesn't get billed at 2/60ths of an hour. It gets billed at 0.1 — six minutes — because that's the smallest unit the timekeeping system allows. The same is true for a one-minute voicemail, a quick calendar check, or a two-line text confirming a call time.
None of that is unusual on its own. Every increment-based billing system does this. The issue shows up when you count how many of those short tasks land on a single invoice.
Why it compounds
Picture a day with eight brief touches on your matter — a few emails, a short call, a quick review of a document someone else drafted. If each of those takes two or three actual minutes but gets billed at the six-minute minimum, that day's real work might run 20 minutes. Billed, it reads as 0.8 hours — nearly an hour.
That gap isn't necessarily wrongdoing. It's what the six-minute increment structure produces by default when a lot of short tasks happen on the same day. But it's also invisible unless you're looking for it, because each individual line item looks completely reasonable in isolation. This is a different mechanism than task padding — padding is a judgment call on one task's duration, while rounding happens automatically, the same way, on every short task a firm logs.
What to look for on your own invoice
- Several entries in a row billed at exactly 0.1 or 0.2, especially for tasks that plausibly took less time than the minimum
- A pattern of short tasks that repeats across many invoice periods rather than appearing once
- Entries like "review email," "brief call," or "confirm receipt" that recur at the minimum increment multiple times per week
One or two of these on an invoice is normal. A pattern of them, month after month, is worth a direct question. It's a different pattern than block billing, where the problem is tasks bundled into one large entry rather than many small entries each hitting the minimum.
What to ask
You don't need to accuse anyone of padding time to raise this. A neutral, specific question works better than a general complaint: "I noticed several entries this month billed at the minimum increment for what look like short tasks — can you walk me through your firm's rounding policy, and whether tasks for the same matter on the same day get grouped before rounding?"
Some firms group same-day, same-matter tasks into a single entry before rounding, which meaningfully reduces this effect. Others round each task independently. Knowing which policy your firm follows tells you whether this pattern is expected or worth a closer look — and if it turns out to be worth raising, our guide on how to dispute a legal bill walks through how to do that without damaging the relationship.