This is so hard to predict, for me, because 1) we're in a HCOL area (for now), 2) we have young kids, and I assume spending will go down when they leave the house (outside of spending spike for college costs), 3) Our mortgage is more than 1/3 of our spending, and is theory is gone in 15 years.
So... we currently spend ~90-100k for a family of 4, but if we FIRE in the next couple of years (as I expect), it will lower for awhile (less kids activities paid for, just for the sake of childcare, less other expenses)