I was able to do it in a few months of dedicated PE after a long time of newbie type stuff. If you’ve PE’d in the past, then you may move into some more advanced stuff.
I have recommended strongly to read the “Mem’s Momentous Rapid Gain Mechanism” and I’ve posted my modification in that thread. In about 2.5 months I was able to go from 7-5/16 to 7-7/8 and am over 8 now in the new year. In Girth I went from 5.5” to about 5.9” Depending on strength of erection, I’m def pushing over the 8x6 goal that I had. Now I’m trying to get myself motivated for the next half inch or so. It’s tough with work and life the way it is right now so I am basically in a maintenance groove with some days of full sequences.
Anyway, your goals and timeline are more than reasonable in my humble opinion (yes, I spelled it out! Ha)
Good luck and stick to it. More than anything, dedication wins the day in PE.
Oh, and also listen to your dick.. The signs that are posted by several veterans here are SO key. Whenever I over-did it, I got little or no gains. When you find the sweet spot, Mr. Happy really is happy and will let you know to keep going.