Six months ago we made one simple change that gave our whole team back hours every week: no meeting at RIVER runs longer than 40 minutes. Not a guideline. A hard rule. Calendar invites are 40 minutes or 25 minutes. Never 60. Never 30. The pushback has been almost zero, and that tells you everything you need to know about how much value those last 20 minutes were actually providing.
The reasoning is straightforward. Watch any hour-long meeting carefully and you'll see the same pattern:
- Minutes 1-5: Setup, small talk, waiting for latecomers
- Minutes 5-30: The actual content - decisions, discussions, information exchange
- Minutes 30-45: Repetition of points already made, tangential discussions, "while we're all here" topics
- Minutes 45-60: Winding down, "any other business" (there's always other business), scheduling the next meeting
The productive window is minutes 5-30. Everything before it is ceremony. Everything after it is entropy. A 40-minute meeting captures the productive window and cuts most of the waste.
$37B
estimated annual cost of unnecessary meetings in the US alone
Source: Atlassian, Time Wasting at Work Survey, 2019
Why 40, Not 30?
We tried 30-minute meetings first. They felt rushed. Complex topics genuinely need more than 25 minutes of discussion time (accounting for the 5 minutes of setup that every meeting inevitably includes). The 40-minute window gives enough time for substantive discussion without creating space for filler.
The 25-minute option is for updates and quick decisions. Anything that needs more than 40 minutes is either two meetings or a workshop with a different structure.
The Back-to-Back Problem
The other reason for 40 minutes instead of 60 is transitions. In an enterprise day with back-to-back meetings, a 60-minute meeting followed by a 60-minute meeting means two hours with no break. No time to process what was discussed. No time to act on decisions. No time for the bathroom.
A 40-minute meeting leaves a 20-minute gap before the next hour boundary. That gap is for notes, follow-ups, bio breaks, and the mental transition between contexts. It's not wasted time. It's operating time.
What Changed
Meetings finish early. Most of our 40-minute meetings end at 30-35 minutes. The constraint creates urgency. People get to the point faster. The facilitator cuts tangents sooner. "We only have 10 minutes left" is a powerful focusing mechanism.
Better preparation. When everyone knows the meeting is 40 minutes, presenters prepare tighter. They send pre-reads. They cut slides. They arrive knowing what they need to get out of the room.
Nobody has ever said "I wish that meeting had been longer." Not once. The stuff that doesn't fit in 40 minutes? It goes in a document or gets its own focused session. People get their time back, and the work actually gets better.
Tim Hatherley-Greene
Chief Operating Officer
Fewer meetings. The 40-minute constraint forces people to ask whether a meeting is necessary. If the content doesn't justify 40 minutes of group time, it becomes a document or a Slack thread. Our total meeting count dropped by roughly 20% in the first month.
The Pushback
The only resistance came from client meetings where the client expects hour-long slots. We handle this by booking 60 minutes in the client's calendar but running to our 40-minute structure internally. If we finish at 35 minutes, we end the meeting. Nobody has complained about getting 20 minutes back.
Workshop-style meetings are exempt. Discovery sessions, architecture reviews, and sprint retrospectives sometimes need more time. But these are scheduled with a clear structure, breaks, and facilitator - not an open-ended calendar invite.
The 40-minute rule isn't revolutionary. It's a small, mechanical change that frees people up to focus on the work that actually matters. Try it for two weeks. You won't go back.