what is "on or before" ?

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"On or Before" is a retention criteria used in Mixpanel's analytics platform, often used with measurement types of property sum or average. It looks at the total activity done during the period between the start and end event. For instance, if you want to look at the 30 Day Lifetime Value (LTV) of e-commerce users, you would look at the total money spent on purchases from sign-up for 30 days. This includes looking at revenue spent from Day 0, Day 1, up to Day 30, where revenue is a property on the event purchase. Similarly, if you want to look at the 30-day Average Revenue Per User (ARPU), you would look at averaging the total revenue spent per user within the first 30 days.You can find more details about this in the Mixpanel documentation.

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