Still, the F16 is 16 hours of maintenance per hour of flight or something close to that. Which probably isn’t terrible compared to other aircraft but doesn’t seem sensible for something without aircrew
I assume there are shortcuts like extending the service life of particular consumables and whatnot.
Even something like a Gripen, designed to be run from makeshift airfields needs 10 hours of maintenance per hour of flight. Maybe it’s just hard to build supersonic, combat capable airframes as was suggested above.
Could the hours of maintenance be dropped significantly in wartime: if you don't care about catastrophic failure modes over a foreign country?