A 90-minute deep block
One protected 90-minute block per day for the hardest task. No meetings, no messages, no tabs.
Run a 30-day cycle with a 90-minute deep block.
The Cycle Planner walks you through six steps and gives you a clean plan to start from. We'll prefill the habit, the suggested length, and a starter exit condition.
Plan a cycle with this habit
Ninety minutes is the natural length of a high-attention work cycle. A daily 90-minute deep block puts the hardest, most-leveraged work at the front of the day and lets it run on a single sustained attention curve. Done consistently, it changes what one workday is worth.
What it looks like
Same block, same time, every weekday. First thing if possible, most people’s deepest attention is in the first three hours after waking. Block it on the calendar as “deep work” with no more detail. Tell the people you work with this is a fixed slot and not negotiable except for genuine emergencies.
Inside the block: one task, one document, one thread. No tabs that aren’t load-bearing. No messages, no email, no Slack, no phone. The first ten minutes are usually the slowest; ride past them.
Why it works
The cost of starting deep work is high. Once you’re in, the cost of continuing is low. A 90-minute block earns its place by paying the start-up cost once and then drawing on cheap continuation cost for the next 80 minutes. Two 45-minute blocks cost the start-up twice and produce less.
The compounding effect is on what gets done. Across a 60-day cycle of consistent 90-minute blocks, the kinds of work that previously took weeks tend to clear in days. Hard problems get the kind of sustained attention that solves them.
Common pitfalls
The first pitfall is letting it slip in busy weeks. Busy weeks are when it matters most. If everything else is meetings, a 90-minute deep block is the only thing standing between you and a week of pure synchronous work.
The second is using it for low-leverage tasks. Inbox zero is not deep work. The slot is for the one task whose completion would change the most. Choose accordingly.
The third is going longer. Two-hour blocks are heroic and unsustainable. Ninety minutes is the floor and the ceiling for daily use.
A 30-day cycle suggestion
A 60-day cycle, weekday only. Success criteria: 18 of 22 weekdays per month, the block taken in full.
Exit condition: when the block has become the load-bearing structure of the workday and the rest of the calendar bends around it.