All 3 of my sons aspirated (dysphagia), but the speech pathologist had us thicken the milk instead of using a g-tube. In some ways, the tube would have been easier, since it took 2 hours per feeding much of the time! In any case, they all gradually outgrew the aspirating... they did not do well with runny baby foods (had to thicken those, too), but as they transitioned to finger foods it became easier. It varied, but was around 10 months with each of them. I know this sounds IMPOSSIBLE to survive that long right now. You'd better believe I struggled with some depression when my third son started doing the same thing (it does tend to run in families, we were told), but he's 3 now and it's a distant memory. In some ways the third was the hardest because I pumped for him for over a year and also because I knew it was going to be such a long time, but there was some relief in having a diagnosis. With the first two, we struggled along and wondered why on earth they kept crying when they were nursing. We never found out what it was with #1 (he actually became content to drink his bottle flat on his back at 3 months old), and we finally had it diagnosed when #2 was 5 months old. So I guess the bright side is that you know exactly what is going on and you know it won't last forever. I have 2 friends with handicapped children that still have g-tubes at 5 and 7 years old.
Hope that helps!