I've been knitting about a year and a half. My dd wanted to learn, and I had to learn to teach her. We found a mom-daughter knitting group and the folks there helped us learn...and between times I watched the videos here on KH--couldn't be where I am without that. Also, something I haven't seen recommended too much--the first book I bought was Knit-Fix!
I figured with all the mistakes I was making, it would be good to figure out how to fix them without having to wait weeks for someone to show me what to do. Once I realized things could be fixed, I got much more adventurous!
As to how much I knit, it depends on the schedule. I usually take a small project with me anytime there's the possibility of having waiting time---when picking up a dd from work, or going to a restaurant and waiting for food. My main knitting occurs on Tuesdays...my dd has a 1-2 hour trumpet lesson, and a 2 hour jazz rehearsal, so I get at least 3 hours in on Tues!
I also sit with my little girls as they are going to sleep (long story), and I get 20 minutes or more each night doing that. If I ever watch a movie or anything like that, I knit. Basically any time I find myself just "sitting" I try to knit.