How long should I cook pasta sauce?
Yes, with any kind of 'stewing' sauce, the flavour improves the longer you cook it (provided it's a slow, gentle process). The longer you leave it, the more chance the flavours have to 'marry'. I have a recipe for a pasta sauce that calls for 6 hours of slow simmering!

You may also have noticed in the past that left over pasta sauce that you eat the next day is really good, for the same reason as above. Any stew, in fact, like bolognese, casserole, chilli, bourgignon etc, is really delicious when left overnight and reheated.