What is the legality of them asking about that?
I did the 340th thing and they do expect the 6 days/month which worked out to Sun through Fri for me most of the time. They look at the annual total to see compliance (72 days/yr) and even then give you a letter saying to do better next year. With that in mind, you may be able to do 10 or 11 short trips and one longer trip. You could also do the 6 days over a weekend (less weekdays missed) if you do a X-C. They do have rules about the length of the trip based on how the travel was paid (UTA travel vs MPA travel).