Whom ever you buy the chips from, you'd have to ask them what arrangements they can do for you. But when it comes to Bizwoo/Nekonos I do know that purchasing of the assembly process is a separate cost and you arrange the courier pickup from their offices on the finished product which is also a separate cost, which is a lot cheaper than I expected. So keep that in mind.
Once Bizwoo (Bulk Chip buyer) and Nekonos (Assembler) get the Chips, I think the expected time to completion was in the region of 2 weeks.
I'm not sure about other assemblers, there was not that many when I was making my pre-orders, especially not in Europe, only 1 in the UK, which is Enterpoint, whom is opting for a rather different design.