This is a manager who doesn't understand what they are asking or the complexity involved. I suppose the appropriate response should be that time to completion depends on the accuracy needed of the final 3D model as it's going to take a few months minimum to learn entirely different skill sets, oh and you'll need to include the hardware and compute costs for the storage and rendering time. Also you'll need either a sim card or a physical base station for the drone with an internet link. I..uh...may like trying to solve problems.