Re: How much training per week?
I've become busy enough that I train about twice a week in formal class, and twice a month on a weekend at the dojo. I often practice independently, which includes all of my martial arts skills and not just aikido, plus I have some kung fu friends I hang out and train with once a month or so.
I also took a job where I use my skills all day long (PE teacher at a "second chance" middle school in NYC). That has really shifted the focus of my training.