...
The forecast length is defined by the length of the external forecast time series (in this example ImportCOSMO2). You can define a mimimum and / or maximum forecast length (minForcastLength / maxForecastLength). If the actual forecast length of the external forecast looked at is shorter than the minimum forecast length (in the example less than 3 hours) the forecast length is set to this minimum forecast length (in this example 3 hours). If the actual forecast length is longer than the maximum forecast length (in the example longer than 30 hours) the forecast length is set to this maximum forecast length (in this example 30 hours).
The logging will provide you with the information which forecast length was used in the run, see example below
...