I give it 20-30. Think about what it would take to create a robot that can go into your house, crawl into your crawlspace (everybody's is different), analyse the specific problem that your house has, fit new pipes/wires including turning off your electricity or water supply, something which is also specific to each house. How long have we been told that self driving cars are 2 years off? Because as an engineer, this is a much more complicated problem.