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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 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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