Stats on average customer duration.

Hello, if this is already a thing, please let me know, but it would be great to know the average length of time a customer has remained a subscriber. I can kinda sorta suss this out in Shopify by calculating LTV for each customer with a subscription tag, but that also lumps in their other orders.

This would be incredibly helpful to know where I need to keep my customer acquisition costs, and how aggressively I can market to gain new subscribers.