I was in EE, and in short, you can't. At my university, CS people had about 20 hours of classes a week. EE people were pushing 40's. It becomes next to impossib

I was in EE, and in short, you can't. At my university, CS people had about 20 hours of classes a week. EE people were pushing 40's. It becomes next to impossible to give the focus required to do anything big. My advice would be to get something going during the breaks, and do maintenance during the rest of the term. Or you can drop out like I did if you're really driven and have options or the ability to create options. There were people who dabbled in startup ideas, but any of my serious colleagues (i.e. the guy who started Kik) all dropped out/took a year off and never went back.