8 days to do this 16 layer board,but I think the time is acceptable,even we can do quicker. oh ,just ago.our production tole me another 20 layer board finished now,it cost the same time. Anyway,let me introduce this board. Material:FR4,TG170 (ITE180). Thickness: 2.76mm. min hole: 0.2mm min trace/space:0.11/0.11mm 200*300 mm per panel ,6 units/panel. Immersion gold and press fit hole (tolerance 0.05mm) it is a bit big for such complex board,we advise any one who design such boards to make the panels small. if many units ,X-outs are easy on the panel . Are you designing some such complex boards? Try us.