My son is 37 months, and now only nurses down to sleep for naps and nights (except for special occasions like his birthday or when he's sick - then he gets more). I think he nursed every hour or so, though, until he was about 2.5, which was when I started cutting back to before and after sleeps. Then about 2.75 years was when I cut back to just going-to-sleep times. I was feeling really touched out, and was afraid I might need to wean him entirely if I didn't start setting limits. So now we're at a good level. I think we can keep this up for a long time. Hopefully until he is ready to let it go on his own.