Zero free time is my problem now also.
I used to do models all the time when I was younger. This past Christmas, after listening to me reminiscing, Jen got me a wooden model kit for "The Bounty". It's one of the real intricate ones that you have to do all the planking on, and even cut and sew the sails yourself.
I'm having fun with it, but even after working on it all winter, I don't even have the hull fully together yet.
At this rate, I'm guessing it will take me about three years if I take my time and do it right.