https://pterodynamics.com/
The P4 model doesn't have very long endurance, only about an hour. But the P7 (under development) has an endurance of 9 hours. That would be more in line with what witnesses are reporting.
This seems like a good match with at least the drones that look like V tailed swept wing aircraft with navigation lights. So these may be Navy assets trying to track or detect the mysterious UAP.