Kefiw

Archived noindex page. Kefiw's public focus is Property decision help.

Archived page

This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

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Deep Work Capacity · Focus Horizon

Exponential focus decay, e^(−0.01×min) · half-life ≈ 69 min · floor at 0.

Focus is not steady — it decays exponentially from the moment you start. Quality = 100 × e^(−0.01 × min), floor at 0. Half-life ≈ 69 min. After that every additional unit of time delivers half the output. The tail is where you make typos and bugs.

Part of: Cognitive Throughput

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Deep Work Capacity · Focus Horizon
Focus Decay Curve · e^(−0.01·min)
0m120m240m
Focus Quality
63.8%
Status: Sustained_Focus
Good signal · attention still resolving detail
Time spent
45 min
Horizon left (to 15%)
145 min
Decay constant
λ = 0.01/min
Focus Quality = 100 × e^(−0.01 × min), floor at 0. Half-life ≈ 69 min — after that every unit of additional time delivers half the output. Break and recover; don't push into the flat tail.

How to use

  1. Enter minutes of continuous focused work so far.
  2. Quality = 100 × e^(−0.01 × min), capped at 0.
  3. Above 70% = Peak_Focus · 15–40% = Decaying · below 3% = Focus_Collapse.
  4. Horizon shows time left before quality drops below 15% — take the break at that marker, not after.

Examples

45 min into a session
Quality 63.8% · Sustained_Focus · ~145 min left before collapse.
180 min unbroken
Quality 16.5% · Decaying_Focus · grinding on fumes — a 20-min break recovers more than pushing.

Before you act on the result

Logic tools help expose a tradeoff, but they cannot see the full situation around the decision. Use the result to slow down the choice and name the assumption that matters most.

If one input drives the answer, test that assumption before treating the result as stable.

Next up

Focus collapsing? Kill context switches first.Task Switching Tax · Context Overhead → Quality tanked? Check your decision budget.Decision Fatigue · Willpower Battery →

Frequently asked questions

› Does everyone decay at the same rate?

No. λ varies by person, sleep, and task difficulty. 0.01/min is a rough baseline — adjust mentally if you know yours is flatter or steeper.

› Why cap at 0? Troubleshooting

Exponential decay never reaches 0 mathematically, but focus quality below ~3% is operationally dead. The cap prevents misleading "2% focus" readouts that suggest you are still working.

Tips & related reading

See the Cognitive Throughput hub →

Tips & how-tos

Relevant links

Related tools

Task Switching Tax · Context Overhead

Calculate the hours per day you lose to juggling concurrent projects. Each additional context costs 20% of remaining capacity — CPU-usage view.

Decision Fatigue · Willpower Battery

Model remaining willpower across the day. Every decision draws from the same finite reserve — trivial × 1, moderate × 5, heavy × 10.

Signal-to-Noise · Content Throughput

Measure how much of your daily information intake converts into actionable decisions. Throughput-pipe visual with clogged / flowing state.