I gained about 1/4” in length and a little girth with a very inconsistent schedule. Mostly manual exercises and time in the tube. I think if your serious you will gain more, especially if you move onto exercises like hanging. I don’t know, I am winging this and taking things slow. I would rather have a 6” penis that works than a broken one any size. Listening to your body is suggested many times here. When you push the limits you get maximum chance of gain at maximum risk of injury. Someone who enjoys pain with their pleasure could easily over do it IMHO. If you have problems, stop. Readjust and let your body fix itself. Newbee statement, take it for what its worth.
Crazy Dave