I fed my elder son totally until he was nearly 3 years old( I was about 5 months pregnant at that time) I pumped twice ( at lunch and before leaving office, sometimes in the middle of the night) until he was 2 years and 2 months old.
Up til now I am still bf my younger son totally. He would still wake up in the middle of the night. He's so fond of my milk and I also planned to bf him until he weans naturally. This time, I got better health and my supply is much more than last time. Another good point is that I got a good Chinese herbalist. When my younger son is having minor sickness, like running nose, coughing, after having roseola, etc(though very rare), I could take the herbs for him as he 's fed on my milk. He could usually recover a couple of days. Except fever, I had not ever given him other syrups from doctors. Actually, I had not taken him for doctor for the above-mentioned sicknesses
I'm also breastfeeding my 17-month-old daughter now. I pump four times a day, morning, lunch, evening and before I sleep, about 17 oz each day. Will feed her directly on weekend when I have time, it's a really good experience and I just feel so close to her when I feed her.... :)