My experience was after a year it becomes 40/60 nutrition and emotional. I weaned two at 2 years. For one child that was a mistake. He was very hurt. He needed that bond. Any other connection I made with him wasn't the same. The third child got to nurse till almost the third year. Only at bedtime with the bedtime story, mainly cause I was too tired to care!
I found that working friends, had trouble because the child clung to them in this way. Then, it's the same old wishy/washy about sticking to NO.