Adding Users to Array and OAuth Token Expiring

A “normal” user token is 4 hours
A “implicit” user token is 60 days.

If you generate 50 tokens (for the same user) when you generate the 51st it’ll kill the first one.
Which sounds like what is going on here.

This makes sense, how do I get an implicit user token?

Sorry for so many questions and thank you for your help!