I even had 0,25" gain in girth after a few days from jelqing only. It wasn't even much of a volume. Started with 150 jelqs or so. But the first gain I made almost immediately. and it wasn't temporary, though I couldn't believe it myself at first. It was as if my dick had just waited for a little stimulus like that to make a jump.
Length was similar: I did make a 0,25" gain in around 3 weeks with the newbie stretching routine (but only 2 sets per stretch instead of 3).