One thought which crossed my mind, context, do the numbers mean mission duration (wheel up wheels down) or only time on station…. Excluding transit time.
One would think “endurance” means the former, but that would suggest a large, short range aircraft…which is oxymoronic.
If the number are written to exclude the transit times and for the sake of argument, let’s say it’s at max range, 1000 km.
Cruise speed is 200 Kmh. That’s 5 hours in and 5 out.
That gives numbers at 24 for unarmed and 17 for armed. Which sounds reasonable.
But, just don’t know.