You can use the DJI Assistant program to hook it up to your PC. Not sure if you can see the flight hours from there, but the DJI forum might have an answer.
Thanks for sharing! What area do you work in that there is that much demand for LiDAR work? How do you think a big battery bank from Anker or Bluettie would work in place of a generator?
I did Guided Wave Testing with a bit of Visual, API570, UT Thickness in Oil and Gas as well. Mostly North Slope Alaska for the last few years before I got tired of traveling haha. Some lower 48 work as well.
Kind of an aside but relevant to your situation, but I have used a QYSEA Fifish water drone with the robotic arm to find and retrieve things that were M30 sized. It could be worth it in your case to buy one, use it to get your drone, then resell it if possible.