A Shopify A/B test should run long enough to cover normal weekly buying cycles, collect representative traffic, and narrow uncertainty around the business effect. There is no universal day count.
Cover complete cycles
Include weekdays and weekends, and avoid stopping immediately after a campaign spike. Repeat behavior can vary by payday, promotion, market, and device.
Wait for useful precision
More traffic is valuable when it narrows the credible interval enough to distinguish a meaningful win, a harmful loss, or a result too small to matter.
Set rules before launch
Define minimum runtime, primary outcome, practical effect threshold, and maximum runtime before viewing results. This limits decisions driven by temporary swings.
Run the test in Shopify
Sofcy supports URL, template, theme, and custom JavaScript API experiments.
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