To extend a paid or ongoing reservation you must log in into your account through the Auting website and click on the TRIP EXTENSION button in the trip section.
The extension is a new reservation.
The minimum period is 1 hour; the fare will be counted as a 24-hour day. In fact, fares are calculated on a 24-hour basis.
The extension must be issued at least 4 hours before the end of the trip.