From tapeout to mass production can be done within seven weeks if everything goes OK
TO - beginning of March.
Tapeout to samples:
40nm, 28nm - 8 weeks
20nm - 4-5 months
Prove me wrong.
Missed by two weeks. 20nm has many flavors, layers selection etc. Apparently they've choose a simple variant and were able to do it in 3.5 months.
Lot of good it did them in terms of ASIC power/performance.
Doesn't matter what variant they chose because you stated that knc would take 4 months minimum and they did it in 3. Also you told me 5 months in PM.
Admit it, your magic crystal ball is not nearly as accurate as you suggest.