It took about 3-4 months. I did not leave the country and started with my new employer within the 10 days. My new employers' lawyer lodged the I-129 (application for change) during employment with the first employer and I started with the new before the approval came back under advisement of the lawyer. If it came back rejected I suppose I would have had to leave pretty quick.
That's great to know. You probably just saved me and my wife a few grand and a lot of hassle bouncing in and out of the country! This is a great visa, but it seems (to me, at least) like they rushed thru defining some parts of it.
