Based on my experience the build time quoted by Frogbeats does not include shipping to/from China. On last Monday (18 Mar, 8 1/2 weeks after impressions arrived at Frogbeats) David informed me that my C4s were done and the build time was 7 weeks. However as you can see from the info in my post above they were obviously still in China at that time.
I think it would be more transparent (and useful) if Frogbeats gave an estimated 'fullfilment time' that ran from the receipt of impressions at Frogbeats to the date of shipment to the end user from Glasgow or whatever final shipment point is used. Now I understand that shipping times are not under Frogbeats control but an average time might be used which means some would be a bit under, others a bit over.
Working on a way to display more transparent waiting times. Unlike UPS, though, DHL do not have these stupid delays, so as soon as your CIEMs are shipped out they will arrive within 2 working days.