NJA (or any fractional, for that matter) probably wouldn't be a good benchmark because they 1. have abnormally high utilization and 2. a high number of reposition legs.
We fly roughly 30 hours/mo in our CJ2+, with an average leg length around 370nm and average segment length of 1+15. Of course, our milkrun is a 550nm trip in 1+35 but a whole bunch of short 90-150nm segments skew our average lower.