I just purchased a new MacBook Pro Retina and I am trying to migrate from a late 2006 MacBook running Snow Leopard. Because the Pro does ont have a LAN am using a Lan to Firwire adapter.
I tried last night and it went about 5 hours overnight. This morning Migration Assistant said one minute remained I let it run for another hour but nothing. I quit that session then found out from here that I needed to upgrade the Snow Leopard MA to V1.1. So I downloaded that and did a restart. I ran MA again and Migration Assistant went about 2.5 hours and then one minute remaining again.