Number of visits after first visit

[Prydenman]

Hi!

I want to calculate the average number of purchases made during the following 30 days by customers, starting with the customers purchasing product A. The purchase of A is the rolling start of the timeline. If product A is purchased again I would also like to reset the count, meaning that the same customer may be counted twice with two different numbers of purchases.

[technolog]

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Your insights and updates will greatly assist others who might be encountering the same challenge.

[Greg_Deckler]

@Prydenman Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.