16 days worth of work spread over nearly two month, well over 350 hours. I did everything by hand - the painting, the sculpting, the details, even a majority of the sanding. The only power tool that was used was a sander to help make the front bits even, that was it.
First time I used it I was... On Korlus, I think. Just finishing up if I remember it right. "Killed" both squad mates, and took down most of Shepard's armour and health, too, but didn't quite kill him before ducking behind cover.