We plan on paying for undergraduate college (my wife's #1 priority), on giving them a small amount as they start adulthood, and then aren't making anything more an overt goal. (The reality is that in 95+% of scenarios, we will end up with an estate or giving opportunity of multiple millions of dollars, by the natural variability of personal/defined contribution retirement savings.)
I am certain to work past my minimum FIRE date (as that is already in the rear-view mirror) because I enjoy my job and the kids are in elementary school anyway. That is what's allowing us to expand our plans to full college and small "get started" gift.
We'll make the call on other giving as we get older and see how things are developing. I don't think I'd work years longer at a job I didn't love for the sole purpose of increasing my giving, but I personally don't have to answer that question.