Time blocking for beginners: plan your day with buffers
Time blocking means giving each task its own slot in your day, the way meetings already have one, instead of working from an open list. For beginners, the thing that makes it work is buffers: short empty blocks between tasks, so when one thing runs long, the rest of the day doesn't fall over like a row of dominoes.
What time blocking is (and isn't)
A to-do list tells you what. A time-blocked day also tells you when. You look at the day as a set of containers: 9:00 to 10:30 for the proposal, 10:45 to 11:15 for email, and so on.
Cal Newport popularized the method in Deep Work (2016). He suggests planning the workday in blocks and, just as important, redrawing the plan for the rest of the day when it breaks, rather than abandoning it. There's also an old observation that supports the idea. In a 1955 essay, C. Northcote Parkinson wrote that work expands to fill the time available for it. A block gives a task a container, which helps it end.
What time blocking isn't: a promise that every block will go exactly as drawn. It's a draft of your day that you're allowed to change.
Why blocks without buffers topple
Here's what happens when blocks sit edge to edge. Your 10:00 meeting runs 20 minutes over. Your 11:00 writing block now starts at 11:20, so it ends at 12:50 and eats into lunch. Lunch pushes the 1:30 block, which pushes your 3:00 errands. By 5:00 PM, a single 20-minute overrun has bent the whole afternoon.
With a 15-minute buffer after that meeting, the same overrun costs you five minutes, and the rest of the day barely notices.
How to time block your day in 7 steps
- Place the fixed events first. Meetings, calls, appointments, pickups. Everything else fits around them.
- Pick one or two focus blocks. Make them 60 to 90 minutes each, in the hours when your mind is clearest. Put your most important task in the first one.
- Batch the small stuff. Email, messages and quick admin go into one or two 30-minute blocks instead of leaking into the whole day.
- Add buffers. Leave 10 to 15 minutes after each meeting and focus block, plus one open 30-minute block mid-afternoon.
- Size blocks a little bigger than your guess. Most of us underestimate how long things take, so if you think 45 minutes, block an hour. (Here's why that happens.)
- Keep the last block lighter. Use it for wrap-up, loose ends and a short look at tomorrow.
- Redraw when needed. If a block breaks, don't shove everything down the line. Re-plan the rest of the day once, then carry on.
How much buffer is enough?
There's no scientific number. These are practical starting points to adjust after a week or two:
| Your day looks like | Buffer after each block | Open time |
|---|---|---|
| Mostly quiet, few meetings | 5–10 min | One 30-min block in the afternoon |
| Several meetings | 10–15 min after each meeting | 30–45 min in the afternoon |
| Constant interruptions (support, retail, kids at home) | 15 min | Plan only half to two-thirds of the day |
| Travel between places | Travel time plus 15 min | One 30-min block |
A worked example
Sam is a product designer. Thursday's fixed events are a stand-up at 9:30 and a design review at 1:00. Here's the blocked day:
| Time | Block |
|---|---|
| 8:45 AM | Email and messages (30 min) |
| 9:15 AM | Buffer |
| 9:30 AM | Stand-up (15 min) |
| 9:45 AM | Buffer |
| 10:00 AM | Focus block: onboarding screens (90 min) |
| 11:30 AM | Buffer |
| 11:45 AM | Admin: feedback replies, tickets (30 min) |
| 12:15 PM | Lunch |
| 1:00 PM | Design review (60 min) |
| 2:00 PM | Buffer |
| 2:15 PM | Focus block: changes from the review (60 min) |
| 3:15 PM | Open block (30 min) |
| 3:45 PM | Could: tidy the component library (45 min) |
| 4:30 PM | Wrap-up and a look at tomorrow (15 min) |
| 4:45 PM | Done for the day |
Now the test. The design review runs 25 minutes over and ends at 2:25. The buffer takes 15 of those minutes, so the focus block starts at 2:25 instead of 2:15 and runs until 3:25. The open block absorbs the last ten minutes. Everything from 3:45 on happens exactly as planned.
If the review had run two hours over, buffers wouldn't be enough. That's when you rebuild the rest of the day instead: here's how to handle a day that falls apart.
Beginner mistakes
- Blocks edge to edge. It looks efficient on paper and topples by 11 AM.
- No room for meals or breaks. You'll take them anyway, so plan them where they won't come out of a focus block.
- Every block the same size. A phone call isn't a 60-minute block, and a report isn't a 30-minute one.
- Treating the plan like a contract. It's a draft. Redrawing it is part of the method, not a sign it isn't working.
- Blocking a whole week in detail. Start with one day. Plan tomorrow each evening; one day at a time is much easier to get right.
A simple way to start this week
- Tomorrow, block only the morning: one focus block, one admin block, buffers around both.
- At lunch, notice where the buffers went. Did they absorb something?
- The next day, block the whole workday.
- At the end of each day, adjust your block sizes to match how long things actually took.
After a few days you'll know your real numbers, and the plan will start to feel less like a guess and more like a map.
Time blocking in Brizemi
Brizemi builds a realistic day around your calendar's fixed events, with breathing room between things, so the buffers are part of the plan from the start. The Today screen sums the day up in one line, like "Tight, but it fits · free from 6:45 PM", and the Now card shows the minutes left in what you're doing. When something runs long anyway, Rescue rebuilds the rest of the day around what's fixed, and Rescue is always free.
Get Brizemi for iPhone or Android and try a day with the buffers already built in.
Questions people ask
What is time blocking?
Time blocking is planning your day as a series of time slots, each with one task or type of work, instead of working from an open list. Meetings already work this way; time blocking gives your own tasks the same kind of slot.
How long should a time block be?
For focused work, 60 to 90 minutes is a common starting point. Small tasks like email and quick admin work better batched together into one or two 30-minute blocks.
How much buffer should I leave between time blocks?
As a practical starting point, leave 10 to 15 minutes after each meeting or focus block, plus one open 30-minute block in the afternoon. If your days are full of interruptions, leave more.
What happens if a time block runs over?
Let the next buffer absorb it. If the overrun is bigger than your buffers, re-plan the rest of the day once around your fixed events instead of pushing every block down the line.
Sources
- Newport, C. (2016). Deep Work: Rules for Focused Success in a Distracted World. Grand Central Publishing.
- Parkinson, C. N. (1955, November 19). Parkinson's law. The Economist.