Comments
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                The connector is CallRail @MichelleH. Above is the duration set up. Currently I have it updating through yesterday's date.
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                @RobSomers , did I set this up right? I clicked the link you provided but I am having a hard time understanding what I should put as my preceding and following values. thanks!
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                @RobSomers Yes, I want each and average time between purchases for all customers. Will I keep the group by function that I listed above, and then add the rank & window?
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                Yes @mhouston , I do want to find the average time between purchases. After changing the group by set up - I did notice that the value for the new 'avg. time between purchase' is returning the same value as the original 'time between purchase' column.
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                Sure @MichelleH ! Here is how I set up the group by function