Is it worth it to keep pumping ?

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At what point do you decide to throw in the towel on pumping because the amount of time spent isn’t worth the output?

My baby is 10 months and I wanted to give her breast milk as long as possible, but with my supply lowering, I wonder what amount of milk is worth continuing to pump for.

at what level (e.g., 5 ounces a day? 10?oz) is it no longer really giving baby any benefits above formula?