Linctex
That's an excellent question.
The filters I run are pretty big, approx 1.5-2 quarts. The full flow is an Amsoil Eao-26, and the Bypass is an Amsoil BP-100.
3 full flow changes, and 1 Bypass change for approx 6-8 quarts plus 5 quarts of top off for a total of 13 quarts.