Does the 7 day turnaround hold up for more complex boards (8-12 layers, laser drilled, blind micro-vias etc.)? Not looking for a detailed quote - just a hand wa

Does the 7 day turnaround hold up for more complex boards (8-12 layers, laser drilled, blind micro-vias etc.)? Not looking for a detailed quote - just a hand waving answer. I'm in the UK and we have our own electronics assembly but the actual PCBs are made elsewhere. Lead time on a bare board almost seems to be a direct multiple of the number of layers, however much you are willing to pay. Our ability to design and build prototypes has got faster and faster on some projects, but having the board made is the limiting immovable factor.