Date: June 3rd, 2023 3:02 PM
Author: Fantasy-prone Kitty Cat
No upper limit
UFOs have been observed since before drone tech matured
They sometimes move much faster than drones
They sometimes appear in space
They sometimes change shape and color, or even split into pieces
(http://www.autoadmit.com/thread.php?thread_id=5349641&forum_id=2#46386554)