Hi Nick - I reckon on average about 6-8 weeks depending on whether it goes well or its a bit of a battle, not sure how long most people take ? At the moment I don't seem to have the time to so anything as 18 day old Fred seems to need feeding, winding, nappy changing etc. every hour and the P61 Black Widow cockpit I started a few weeks back doesn't seem to be moving on very fast at the moment!
All the best, Alistair