Yes, your degree can be completed in four years, but it will depend on a number of factors:
1) Are you maintaining a full-time course schedule (at least 12 credits per semester)?
2) Are you successfully completing each course or do you need to retake courses?
3) Are you sticking with one major or changing majors to something that requires significantly different coursework?
4) How did you do on your placement tests?
Pay special attention to that last one, since that's the one that will come up first. When entering college, you may need to take placement tests. (You may also skip them if you have SAT scores, AP courses, or other things that substitute for the placement test.) Take the placement tests seriously. People sometimes get indifferent, stressed, etc. When they do, they stop giving the placement test their full attention. That usually results in a bad placement, which in turn means that you might need to take developmental courses.
There's nothing wrong with developmental courses IF you need them. That's why they're there. But if you're taking them just because you had a bad day at the testing center, that's going to slow your progress down.
Does that make sense?