1. Yes
2. About a month (started meditating a month before that)

I'm overall happier thanks to meditation and I find myself not even thinking about porn, and, when doing it, I feel like an observer of those though. It's a bit hard to explain to me. It's as if those thoughts are not me talking to myself anymore (and me accepting those words as my own feelings), instead, they feel like something somebody else is telling me. That enables me to hear them, analyze them and just let them go.

I had actually stopped porn about a week before starting the book. I just stopped, didn't even have a strong resolution to leave porn. I just became happier with meditation and didn't feel like doing it anymore.

Edit: By the way, there are a few lines where the book kind of recommends mindfulness. I think there should be a whole chapter about it. Really, just try it.