<p>15 hours allows you the chance to drop a class if you really have to, without going below the required 12 hours to be a full-time student. Right now, my incoming freshman D has 12 hours, but is waitlisted for the Spanish class she needs (and it looks pretty good that she’ll get it). I wouldn’t have wanted her to have more than 15 hours. As I said before, though, it depends entirely on the kinds of classes you’re taking.</p>