Hi,
This can be considered in the next release. It requires a change in the grib server and in client program.
The data is currently at 1 hour intervals (for 3 days).
BTW. the ARPEGE-EU data provided by Meteo France is only out to 114 hours and not 120 hours (5 days).
I will open an issue in the development site regarding this fix.
Best,
David