Ariakon on 26 October 2016
Sounds about right, if not even a little low. I remember PS4 and Xbox One shipped 4.2 and 3.9 million respectively over their first couple of months, though I don't quite remember how quickly each shipped 2 million.
EDIT: Went back and looked it up. Yeah, ps4 shipped 2.1 million its first month, and then another 2.1 million its second. The Xbox must have done much the same, as it shipped 3.9 million by January 1st 2014, though it only sold 3 million.
