@Anonymous
I don't know if you are referring to option 1 or 2.
I don't have any reference to anything like that. I could walk you through the steps, but a specific link...I have none.
I am sure there are some blogs or videos out there that might attempt to describe the process.
For the first option, it is quite simple.
1) Create a list and call it what you want. Something like AppLog
2) Add that list as a datasource to your app.
3) In your OnStart, add the following formula: Collect(AppLog, {Title: User().Email})
Now, you will have a running log. Every time a user goes into the app, a new record is created with their email as the title column. The created time will indicate the time.
However, for the second option, there is a doc that describes more about doing that.
