The following is off the cuff and just my opinion without checking our data base for results and time spent. I will be close to dead on on my length guessing, probably a bit mo’ fuzzy on the time frame.
2 inches is certainly possible; but, very few guys gain 2 inches. Most guys can realisticly expect to gain an inch give or take a bit.
As far as the time frame goes? Some guys will have gains very fast, some guys will go 6 months, a year, or even longer with no gains at all. The vast majority of guys will gain 1/2” or better if they stick with it for a year. That might not sound like much; but, that is an half inch you wouldn’t have had otherwise. Also keep in mind that even a small increase in girth has a huge impact in how much meat you are packing. Even if you go just for length you will get some girth gains in the process.
Why not give the n00b routine a try and see what you think? Enough guys are fast gainers that even if you are not willing to commit to a year or more it is worth investing a month to see what happens. But please remember, safety first:
You only have one Wiener so don’t break it.