Most people think of losing focus time as an event: a meeting gets scheduled on top of a work block, the block disappears. That does happen. But the more common pattern is slower and less visible. The three-hour block survives. It just gets fragmented until it's functionally useless.
The Erosion Pattern
Here's how it typically goes. Monday morning you have a clear 9am-12pm block. Someone books a 30-minute sync at 10am — the block is still "mostly" there. Then a 9:30 standup gets added. Now you have 9:00-9:30, 10:30-12:00. A week later someone needs 11:45. Now your "focus morning" is three fragments: 30 minutes, 75 minutes, and 15 minutes. None of them are long enough for serious work.
The calendar still shows those gaps as "free." The day technically has focus time. But 30 minutes before a meeting isn't focus time — it's the time you spend answering email until the meeting starts. Fragmentation is a quality problem, not a quantity problem, and quantity-focused calendar views don't show it.
The question isn't "how many hours are unscheduled?" It's "how many uninterrupted blocks of 90 minutes or more do I have this week?" Those are different numbers, and the second one is the one that matters.
Setting a Weekly Floor
The most effective defense against focus erosion is a weekly floor: a minimum number of protected hours you won't go below. Not a target — a floor. Ten hours of deep work per week is a reasonable starting point for most knowledge workers. The floor exists not because you expect to hit it exactly, but because it gives you something to measure against.
Once you have a floor, you can notice when you're at risk of missing it by Wednesday. That's when you can still do something about it. Without the floor, you only notice on Friday afternoon when it's already gone.
Practical Protection Strategies
- →Block morning hours as deep work before anyone else can book them — treat them like external meetings with yourself
- →Batch meetings into the afternoon: a 2pm meeting hurts focus less than a 10am meeting
- →Create at least one meeting-free day per week and defend it explicitly, not just in your head
- →When someone requests a meeting, default to the afternoon unless there's a specific reason for morning
- →Review your focus hours on Monday and Thursday — two checkpoints let you intervene mid-week
How to Track It
To track focus time, you need a consistent definition. A reasonable one: any uninterrupted block of 60 minutes or more with no meetings scheduled, outside of lunch and commutes. Tag these events in Tempo as your Focus layer. At the end of each week, SIGNAL shows you the total — and whether it's trending toward or away from your floor.
The Shift in Mindset
Protecting focus time requires treating it as a commitment, not as empty space. Empty space gets filled. A commitment creates friction. When someone asks for a 10am slot on Tuesday and that's your focus block, "I have a commitment then" is both accurate and appropriate. The commitment is to the work that makes everything else possible.