How to juggle sorority life with pre-med

[premdusc]

I'll be entering pre-med next year at USC. I also may be interested in joining a sorority. I know this is a very general question, but sure would like some rough idea of what to expect in terms of time commitment. I'm highly motivated academically and getting into a very good med school will be a top priority for me.

If I pledged a sorority, approximately how many hours, especially my first year, would be absolutely required of me for sorority activities? I wouldn't want to join and barely participate. I also want to be realistic about how many extra hours might be spent shopping for clothes for dances, formals, outings with friends, etc.

I'll be keeping a regular schedule but taking advanced classes. Would I really have time to be an active member? Also, for those who know, any info about how much Greek life plays a role on the USC campus would also be appreciated. Thank you.