That is hard to answer by itself. I know the days of the two-man crew are pretty much over, but a robo-gun, a single person and truck is still going to cost nearly as much. I would think that for field work you would have at least 1/2 day, plus back end office support. What numbers are you and were you seeing? As an engineer, we typical price services as T&M with an estimate. Putting someone into a Lump Sum typically increases the cost to hedge any unknowns.