Cohort Creation Issue: Conversion Window Date Error Explained

why do I get this message when creating a cohort based on a funnel with a conversion window that spans several days? “This cohort will not include users who complete the funnel after Jun 30, 2025. Due to the selected conversion window, users can continue to complete the funnel until Jun 30, 2026. To fix this, please move the time window end-date before Jun 30, 2024.”

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kapa.ai
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kapa.ai
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The message you’re seeing relates to how Mixpanel handles cohorts created from funnel reports with long conversion windows. When you create a cohort based on a funnel, Mixpanel needs to determine which users have completed the funnel within the selected date range. However, if your funnel’s conversion window (the time allowed for a user to complete all steps) is very long—spanning several days, months, or even up to a year—users who enter the funnel near the end of your selected date range could still convert well after that range ends.For example, if your funnel’s end date is June 30, 2025, but your conversion window is 1 year, users who enter the funnel on June 30, 2025, could still complete the funnel as late as June 30, 2026. Mixpanel warns you that the cohort will not include users who complete the funnel after June 30, 2025, even though, due to the conversion window, conversions could still happen up to a year later. To ensure your cohort accurately reflects all possible conversions, Mixpanel suggests moving the funnel’s end date back by at least the length of the conversion window.This behavior is consistent with how Mixpanel’s conversion window works: the window starts at the first step and does not reset, and users must complete all steps within that window to be counted as converted. If your report’s end date doesn’t account for the full conversion window, you risk missing users who convert late within the allowed period Funnels Advanced Concepts.If you want your cohort to include all users who could possibly convert within the window, you should set the funnel’s end date to be at least as early as the length of the conversion window before your intended cutoff date.
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Cohort Creation Issue: Conversion Window Date Error Explained | Mixpanel Community