It's likely to take me several months, regardless of complexity: I work in the oil field, and when the gettin's good...well, my job doesn't have a set/fixed schedule: I work from project to project, and right now the gettin's definitely good, so I'm working a lot, with little time off.
It's going to be a real project just to get the time to go home, get my truck, then go back to his house and pick the mill up... to say nothing of then clearing a space for the mill, running power, and THEN disassembling the whole thing, inspecting, cleaning, and diagnosing the z-problem.