How long to nurse on command?

Breastfeeding 4 month old on demand still, was told by my mom that I should stop nursing on demand at this age. Should I really be scheduling his feedings? If so, how do you start that exactly? If not, when do you stop nursing on demand?
Thanks.

Suggested category- Military
LOL
thanks everyone.
'irriated lactivist'- awesome avatar!

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