Is there a limit on study-abroads and internships?

Each college has its own rules about this. Ask somebody at your college; your registrar probably knows.

Here's the thing: you typically pay at least partiall tuition to the college for study-abroad experiences. If you do several of them, you need to make sure you're making progress toward completing the credits and requirements for your degree.

Try to avoid building up too many student loans, especially when you're not making progress toward your degree.

Some colleges (Northeastern in Boston, for example) have internships built into their programs. Northeastern calls them "co-ops." Others don't. Typically, when you're doing an internship you're not earning credits toward your degree, so you're delaying your graduation.

With respect, the only thing you can waste that you can never get back is your time. Spend your time wisely. Usually it's good, when you're in college, to get your work done and graduate. Once you have your degree, you have more choices about how to spend your time.

As far as I know, there is NO limit on studying aboard or internships. In fact, it is encouraged where I went to school. With most schools, it is common to even have an internship while you are student.