<p>4 classes is normal at schools. Works out to 32, which is also the most common. My school required 36, which was really abnormal. I know a few schools require 30, which is fairly abnormal. </p>
<p>Overloading isn’t really overloading if you qualify to do it. Most schools limit what freshmen can take as loads but then it depends on keeping a minimum GPA, which usually isn’t that high a bar. There are at many schools usually limits on how many classes you can take without paying more.</p>