Early Stage Growth • Ballpoint

Early Stage Growth • Ballpoint

Killing creative tests at day 5

How long should you run creative tests for is an age-old question, we analyse 12 months of experiments to find out.

Josh Lachkovic's avatar
Josh Lachkovic
Oct 28, 2025
∙ Paid

TL;DR: We analysed £7.5m of ad experiments to understand how quickly you can make judgements on winners/losers.

We’ve all been there. It’s day two of a new ad test and there’s zero conversions. CPA is currently ‘infinite’ and your CMO is asking “why haven’t you turned that off yet, is it ever going to recover?”

Creative testing remains the most important …

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