You shouldn’t be wondering how much you will gain in 2 months. No one can give you an answer. Nobody knows. You just need to be consistent, use heat, and don’t “over do it”, and eventually you will gain.
As far as masturbation, while actively PEing I personally don’t do it. I used to masturbate 4-5 times a week. Now I rarely ever do. I’m also 52 years old, so that has a lot to do with it. I try and save it for when it really counts. But early in my PE journey, I realized masturbating and PEing, really tired my dick out. (EQ, PI’s)
Now if I was 20 years old that might not be the case. But I’m not 20 anymore, unfortunately.
Currently on decon, so I have been edging and about once a week, I do go over the edge.
Bottom line is, at least in my case, avoid masturbation while PEing. Overworks my cock.
But I’m sure there are plenty of younger gents here who can get away with it. Wish I was one of them!