If you run Interpret or Transfer by themselves (with no other modules running), then interpretation or transfer continues until there are no more invoices ready for that process.
If, on the other hand, you have more than one module open at the same time and want to process invoices as they come from a previous module, select Wait mode in the appropriate job description. Then, when there are no more invoices ready for that process, the module waits, checking for more invoices at 30-second intervals.
For example, if you want to interpret invoices as they are scanned, select Wait mode in the General settings for the Interpret job. Then you can run Scan and Interpret at the same time. If Interpret runs out of invoices, it waits, checking for more invoices at 30-second intervals.
While Interpret or Transfer is waiting, its status is Waiting. To restart before 30 seconds have passed, select Job > Continue (or click the toolbar button). To stop waiting and end a job, select Stop.