26 months vs. 62 months. A weird half.
EDIT: I see you edited the title, but you should also edit your OP. Currently it implies that the PS4 was the previous market leader, but that isn't true at all.
Edited. I really shouldn't post threads before my morning coffee, I am a zombie before I partake of the bean.
At a lot of the places where this has been posted the excuse of "of course it did, it's a portable" has been bandied about a lot, but I feel this is an oversimplification. After all, Vita being portable didn't stop the PS4 outselling it in Japan.