I guess one is two months while the other is six months.
I think someone in the thread mentioned that Hashino wasn't responsible for the story in P4A, and I'm glad to see that isn't necessarily the case. I really liked it as a followup to the characters in P3.
The team directly responsible for writing P4A's storyline was the Trauma Team group. Specifically, Teppei Kobayashi. Hashino was listed under planning tho, so it's not like he didn't oversee the whole thing.