How much buffer time to add between tasks and appointments
Add at least 15 minutes between any two tasks that require leaving one location or mental state and entering another, and 10 minutes on top of any drive time estimate. For appointments, add a separate buffer before the appointment itself for gathering and travel, not just between the appointment and whatever comes after it.
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.
A floor to start from
Fifteen minutes is a reasonable minimum between two tasks that both require your attention, even if they happen in the same room. That covers stopping the first task cleanly, a short mental reset, and getting oriented toward the second one. For anything that also involves physically moving, leaving a building, or driving, the floor goes up:
- 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
Say you have a work call ending at 1pm, a dentist appointment at 2pm across town (a 20 minute drive), and you want to answer a few emails before you leave. Without buffer, the schedule reads: call until 1, dentist at 2, plenty of room. With buffer built in: call ends at 1, gather and leave the house by 1:25 to cover the 20 minute drive plus 10 minutes for parking and the office, leaving only 25 minutes for emails between 1:00 and 1:25, not the full hour it looked like on paper. That 25 minutes is real and usable. The full hour was a number that only existed if nothing needed a transition.
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 is a floor, not a guarantee. Fifteen minutes covers a normal transition: stopping, moving, starting again. A transition that also involves leaving the house or switching from a work mindset to a personal one often needs closer to 20 or 25.
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?
No, only tasks with a fixed external time attached, like an appointment or a call during business hours. Flexible tasks with no real deadline do not need protected buffer, since there is no fixed point they could make you late for.
This article shares practical organizing ideas. It is not medical advice. For diagnosis or treatment questions, talk with a qualified clinician.