I've yet to do a 90 and 90. When I first showed up at AA it was recommended, but I had ASAP counseling as well and that interfered with one meeting a week. I had no real life. I had a job, during the week I went to AA, ASAP, then home to sleep. On weekends I went to meetings and did yard work at my sponsors house. This went on for a year. Some weekends I went to 2 - 3 meetings on Saturday and Sunday.
Year two was a bit more of the same. Somewhere between year 2-3 I copped a resentment and didn't go for a month or more. I got woke up from that.
Since then, I've been hitting at least 2 meetings per week PLUS working with other alcoholics through the Big Book.