Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones · chapter 13 · id atomic-habits-c13-01-the-two-minute-rule-when-you-s

“The Two-Minute Rule: When you start a new habit, it should take less than two minutes to do. Scale down any habit to a two-minute version to reduce friction and get started.”

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Receipts

David Allen, Getting Things Done (2001)source alive

Allen's original rule: if a task takes less than 2 minutes, do it immediately. This is an efficiency heuristic, not a habit formation technique. Clear adapts it for a different purpose.

Lally et al. 2010, European Journal of Social Psychologypaywalled — manual check queued

Simpler behaviors (drinking water) reached automaticity in ~20 days vs complex behaviors (exercise) taking much longer or not plateauing within 12 weeks. Supports the general principle that simpler = faster formation.

Gollwitzer 1999, American PsychologistDOI registry: valid

Specifying concrete behavioral plans increases follow-through. Consistent with reducing the action to a small, concrete step.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.