Yes, that sounds correct. the rears will wear "much faster" than drum brake shoes. I usually just replace fronts and rears at the same time now. also, here in the salt/rust belt, I just replace them every three years whether they need it or not. I have found that the rear disc pins/pads/slides seem to suffer from rust worse than the fronts and like to stick.
2019 Cherokee, 2018 Jetta, 2014 Sentra, 2001 Camry, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300