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It really depends on the class. If it's a popular course, enrollment might be full prior to its start, making adding the course difficult (I wrote about this in another post).
Add/drop period is open for roughly the first two-weeks after classes start, at which time you can change classes. Most classes only meet 2 or 3 times a week, but keep in mind that college classes start covering material on the first day, so the more classes you miss prior to adding a course, the harder it'll be to catch up.
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