The amount of break depends on the look you want, and also the width and material of the pants. If the material is stiff, like denim or heavy chinos, and the legs are narrow, then no break is fine. But if the material is very soft and the pants leg is wide, no break is going to result in the pants flopping around. It'll look bad.
With suit pants I like a tiny break in front. This keeps the leg "anchored" and reduces flopping.