Technically none. And, although it helps a ton, you don’t even necessarily need to be great looking. Seen SuperBad? Some fabulously successful actors have made it without anything more than a high school education (some even less). But the more time you spend perfecting your skills the better your odds of setting yourself apart from the other riffraff and breaking through the haze of mediocrity. You also never know when you’re going to audition for someone who went to your school. A connection like that can be all it takes to catapult you to...a steady paycheck...for 3 months.