You're a little over 7" BPenis EnlargementL, right? That's an inch or more above average, Dude!! Your dick is big!! Your wife is right!!
How long to get it bigger? No guarantee!! You could add an inch in a few months. It might take a year. If you follow DLD's Phase One routine, I find it hard to believe you would not gain at least an inch by next year at this time, for sure. 6" girth? A piece of cake!! My experience has been that I tend to gain in the direction of my original "assets." In my case both length and girth!! Mother Nature was very kind to me. She has been kind to you as well, Dude!! Thank her every day!!
Imagine!! An 8 x 6 dick, the IDEAL size. Visualize, Dude!! Maximize!!
Be consistent, persistent. Don't go crazy, though, and hurt yourself. Ease into it. Give it time. And remember, you have to see your dick with NEW EYES!! I'm serious now!! See your dick with NEW EYES!!
Good luck.