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How many days of data do I need before my campaign data is trustworthy enough to make decisions?

Minimum thresholds before acting: (1) Creative kill/keep decision — at least 4× target CPA in spend, minimum 4 days running. (2) Product kill/keep decision — 7 full days, 4-6 genuinely different angles tested, at least $500-800 total spend. (3) Scaling decision — 5 consecutive days of ROAS above target with stable or declining CPM. (4) Price change decision — minimum 200 sessions at the new price point. (5) Page optimization decision — minimum 500 sessions on the page. Operators who act before these thresholds are making expensive guesses, not data-driven decisions.

Tactical FixSet calendar reminders when you launch. Day 4 reminder: evaluate creatives. Day 7 reminder: evaluate product. Do not check performance obsessively every hour — decisions based on intraday data are almost always wrong. Check once or twice a day during active campaigns, make decisions on 7-day windows.

See this in practice: Read Your Data

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