How much buffer time to add between tasks and appointments
Drifta is an iPhone task app for ADHD that gives every task its own time window.
Buffer time is a deliberate gap for stopping one task, getting ready, and reaching the next. Try 15 minutes as a starting example, then adjust it to your actual transitions. For appointments, count gathering, travel, parking, and walking separately; the extra time you need will depend on the trip.
Buffer time is not extra time, it is the transition itself
When two tasks are scheduled back to back with no gap, the plan is quietly assuming the transition between them takes zero minutes: no walking to the car, no finding your phone, no mental shift from "email mode" to "phone call mode." That assumption is false for basically everyone, and it is more consistently false for ADHD brains, where switching from one task to another carries its own real cost. Buffer time is not padding for its own sake. It is the honest cost of the switch, made visible instead of ignored.
Calling it buffer time also changes how it feels to spend. A gap labeled "just in case" tends to feel wasted if nothing goes wrong. A gap labeled "the transition itself" is doing its job even on the days when nothing goes wrong, since the walking and the mental reset still happened, they just happened smoothly.
Starting examples to adjust
Try a 15 minute gap between two focused tasks if you need a starting point. The numbers below are planning examples, not ADHD-specific minimums. The NHS adult ADHD information pack suggests tracking how long tasks usually take to help with future planning. Note how long stopping, gathering, travelling, and settling in actually take for you, then adjust your next plan.
- Two focused tasks back to back, same location: 15 minutes
- A task ending and an errand beginning: 20 minutes
- Any drive: your estimated drive time, plus 10 minutes for parking and walking in
- Leaving the house for an appointment: 15 minutes of gather time before you walk out, on top of drive time
A worked afternoon with the buffer built in
For a fictional afternoon, say your work call ends at 1pm and your dentist appointment is at 2pm, a 20 minute drive away. Allow 15 minutes to gather your things from 1:10 to 1:25, then drive until 1:45 and use 10 minutes for parking and walking in. You arrive at 1:55, five minutes before the appointment. That leaves 10 minutes for emails from 1:00 to 1:10, not the full hour it looked like on paper. Replace these example durations with your own estimates.
Where the buffer actually gets lost
Buffer time rarely fails because the schedule did not include it. It fails because a "quick" extra task gets slotted into it after the fact: one more email, one more load of laundry, one more scroll. The buffer looks empty on the calendar, so it looks available. Protecting it means treating it the same as a real task, mentally labeled "transition" rather than left blank and therefore fair game.
A simple test: if you would not add a task to a fifteen minute meeting slot on someone else's calendar, do not add one to your own transition slot either. The buffer belongs to the transition, not to whatever feels quick enough to squeeze in.
Appointments need buffer on both sides, but not equally
The buffer before an appointment matters more than the buffer after it, because being late to the appointment is the actual risk. A common mistake is padding the time after an appointment generously while leaving almost no room before it, on the assumption that the appointment start time is what matters most. The appointment start time is exactly the moment buffer needs to have already been spent, not the moment to start finding your keys.
The after-buffer still matters, mostly to absorb an appointment running long, but it is the lower priority of the two if you have to choose where to spend a limited amount of planning attention.
Letting the schedule hold the buffer for you
Building buffer into a mental estimate works until the day gets busy and the buffer is the first thing to get skipped under pressure. Scheduling the earlier boundary directly, as an earliest start time on the appointment itself rather than a private mental note, keeps it visible even on a bad day. In Drifta this looks like setting an appointment's earliest start time to when the gathering and drive actually need to begin, not just its deadline, so the reminder for the appointment arrives with the buffer already accounted for.
For the timing concept behind this, see why every task needs an earliest start time, and for the transition cost specifically, why switching tasks takes so long and how to plan for it.
Common questions
Is 15 minutes really enough buffer between tasks?
It may be enough for some transitions, but it is a planning example, not a minimum or a guarantee. Time a few of your own transitions, including getting ready and travelling, and adjust the gap to what you observe.
Why do I still run late even with buffer time built in?
Buffer time usually gets built into the schedule but not protected from being spent on "one more thing." The buffer only works if it stays empty, which means treating the end of the previous task as the real end, not a soft suggestion.
Should every single task on my list have buffer time around it?
Protect the gaps before fixed appointments first, because arriving late has a clear consequence. Flexible tasks can still need transition time, but you can leave that time unscheduled if the next task has no fixed start.
This article shares practical organizing ideas. It is not medical advice. For diagnosis or treatment questions, talk with a qualified clinician.