~
If you abandon your account, but remember your password, there is no time limit... you can come back whenever you feel like it.
~
Adding up to this, if the user abandons his/er account for more than 180 days and logs in again, the account will considered to be "woken up from long period of inactivity".
You're considered to have woken up if your last login time is 180+ days ago, and the message remains for 30 days.