I'm currently a biology major and I work as a CNA during the summers, which I've done for the last two years. As of now, I have probably 6-7 months of full-time experience. After next summer, I should have 9-10 months. My question is this: how many hours do I need to be COMPETITIVE for entry into the average PA program? And is working as only a CNA, rather than an EMT or something else, going to hurt my chances?