When to delete expired Advert orders is a purely personal choice. Some stations may want to keep them for reference for a year or longer. However, as these old orders build up they will begin to slow several TrafficONE functions. When generating new invoices, for example, it will scan every order in its database every time. If there are several years worth of data, the process can take several minutes to complete.
You can now quickly delete all the unneeded old orders with a simple select-and-delete function.