Say, what happens if you mash the 1-day time increment a few times?
I ran a few tests with short-range drones ( less than 500m km, less than 5 day endurance) and they appear to be functioning as expected, but when I made an ultra-long range drone (40b km+, 365 day+) things started acting funny. They wouldn't move if the time steps were too short!
Ultra-Long Drone
Missile Size: 9MSP(0.45 HS) Warhead: 0
Speed: 1400 km/s Engine Endurance: 9,051.4 hours Range: 45,619.1m km
Second Stage: Size 2 Buoy x1
500km target: 20 minute increment required to move.
1.6b km target: 20 minute increment required
5.5b km target: 3 hour increment required
10.6b km target: 3 hour increment required
38b km target: 1 day increment required
Nothing scientific, just some rather unexpected independent observations.