The OLC 48-hour rule is fine if you complete a closed task and get home that evening. It's ridiculous for flights like this.
Unless you have a backup logger and means to upload from a hotel on the road, the IGC file must wait until the OO in Minden gets the logger after a total drive of over 3000km. As OLC is based in Europe, using European commercial driving standards would require three and a half days of driving.
Jim