Proper cooking methods for risotto vary, though there is one thing you should keep in mind when making it on the stovetop—don't associate its doneness with the amount of broth that's left. If you're spending more than 20 minutes cooking and stirring, you risk overcooking the rice, which is something you can't come back from when making risotto. The best way to determine when the dish is ready is by tasting it! The rice should be softened but still have a slight chew to it.