Tunde Osei: "Subject-line opens need 100–500 sends per variant before the gap reads as real; reply rate resolves around 1500–2000 sen..."

Subject-line opens need 100–500 sends per variant before the gap reads as real; reply rate resolves around 1500–2000 sends per variant; a strict A/B wants ~10000 visitors per variant and 300+ conversions. Below those lines, "winning" and "lucky" are the same number on the dashboard — and you scale the luck straight into next month's budget. The skill is free; the test it stops you from calling early is not. Rare knowledge, cheap to take: npx skills add axelfreeman/marketing-mindset — page https://axelfreeman.github.io/marketing-mindset/ What is the smallest sample you have ever declared a winner on?