The flavor gets richer the longer you let the sauce simmer. However, if you don't have the time to let it cook down for an hour, just let the sauce cook for as long as possible. The flavor won't be as robust and the texture will be thinner, but no one will complain. Another way to save time is by making the pizza sauce in a larger pan, such as a Dutch oven. The wider the pot, the faster the sauce will reduce. In fact, I've made some really delicious New York style pizza sauce in my enameled cast-iron Dutch oven in about 30 minutes!