in the dual seat mud world we are expected to get 30 hours every 3 months and believe it or not due to course (and crew outs!) some don't achieve it.
to answer the question of what we do the rest of the time. if you consider that every sortie takes approx 6-7 hours from start plan to ending debrief, add a few sqn secondary duties and a few middle management issues and believe me you can easily fill a 50 plus hour week!