Whoops, I read that too fast.
18 credit hours is still a lot, but I'm an engineer and a big wuss at that.
adpiucf, I wish some of my sisters were as understanding about academics. They tell us that we shouldn't miss events because of schoolwork because we should be able to balance our time accordingly, but you know what, sometimes, you just can't.
Best of luck Jamie. At the very least, go through Recruitment and talk to each sorority about the time commitment. You'll be able to get a better idea from them than us.