Can you define your objectives a little further?
I am trying to solve the problem, but I think defining what "Less likely to return" is may be important. I was able to write a calculation to find which users' last visits were over 30 min and which ones didn't, but beyond that I think I would need more info.
Thank you for taking the time to look into this for me! I think that calculation is what I need for the first step, which is a big one!
After that, I can figure out how many customers do not return in X amount of time if their order took longer than 30min.
I hope that this message find you well. I was wondering if you wouldn't mind sharing what you think the calculation should be?