Been lurking on this board, need to officially throw my hat in the ring for R2. Submitted 12 January.
I recently had my interview with a Kellogg alumnus as well. It also went long, 1 hour 30 minutes. It was in his office after the work day.
Mostly interview focused in on why Kellogg, why MBA, why now. Asked a few what if questions: what if I know I'm right on a case but my team doesn't agree, what's my approach to get the group to follow my idea. Why Kellogg if want to do finance, is it just to get rich? what makes me different from the other 8-9 people he will interview, why should I be the one to get in, they're usually just as smart, just as accomplished.
So a few tough questions but the interview was very conversational in tone. Went well, hopefully he submits a "recommend" to the adcom. We'll see.