Finalizing the current parking session is recommended, but is not mandatory and is not subject to penalties.
The app will progressively notify the user about the excess of time, up until the ticket is automatically closed.
In any case, a new parking session with the same vehicle cannot be started until the previous one is finished.
Note that it is not allowed to repeat parking sessions in the same zone code for a certain period of time, usually 30 minutes.
See more information in STOP - End parking in progress.