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User is logged out - question

i have a situation here and i just want to understand the logics behind

If i do not ask the user to create an account, a current user exists anyway as far as i know. If i have a workflow like this:


Create new address for current user (user is logged out). Then my address is stored

The question is how long this user is valid?
I observed that, if i create an account, login with that account, log out. Then the previous user disappeared