My first 5 years of sobriety I'd say I averaged 5 to 6 meetings a week. After that I've been kinda all over the place with meeting attendance. At times I went reguarly, sometimes not so reguarly. For a year or 2, I was averaging about a meeting a month, but would jump in from time to time and do a whole bunch in a row. I'm comfortable making 1 meeting a week, I've been making 2 meetings a week for over a year now, and I like to aim for 3 a week but I've got a very full schedule and it's not always possible. It's not necessary either. AA was a bridge back to life for me, and it's worked and still works wonderfully.
I'd like to note that as much as I hated to admit it at the time, when I was not attending AA meetings consistently, I was also becoming a pretty miserable dude. I don't know what the magic is, but I don't question it anymore. When I attend reguarly, I'm a much happier and more grounded person. I look forward to my meetings. I didn't always feel that way.