I'm not sure that's a great comparison: four years would seem about right, given PA Semi's main expertise at the time of acquisition was Power rather than ARM. Designing a custom ARM core isn't rocket science, but it's pretty close: plus you've then got to actually get the things fabricated at sufficient yield.
I am not sure they could have done things much quicker to be honest.
I am not sure they could have done things much quicker to be honest.