CDO's don't always run on time (late arrival, weather, mx etc) and your planned 4 hrs at the hotel can be reduced to zero! So it sometimes makes no sense to even go to the hotel, just to turn around and fly back to base. CDO's can be detrimental to your health and general mood due to interrupted sleep cycles. The good part is we only did 3 in a row with 4 days off, and usually only flew 30-40 hrs a month. And some flights were less than 1 hr.