1. About 5 years (although only 2 years consistently)
2. Yes, absolutely - both
3. When I started, I was skinny (110lbs - after major dieting from 165lbs), along with a proper diet (ie more food), I looked stronger. It took me many years, but that's because it's harder to gain muscle than to lose fat.
I am not allowed to exercise right now for medical reasons and gosh I miss my KB's so much