November has 30 days FYI
So at most 16 days of sales for PS4 to sell that, probably 15 because of tracking delay although that also applies to MS's numbers but 16 for a like to like comparison
I included December first in the number of days, since the press release read "Sony Computer Entertainment Inc. (SCEI) today announced that cumulative sell through for the PlayStation®4 (PS4) computer entertainment system worldwide has surpassed 2.1 million units*1 as of December 1, 2013."