* Major: Some majors are more intensive and may require more than four years to complete.
* Credits transferred: Students who transfer credits from community college or other institutions may graduate sooner.
* Course load: Students taking a heavier course load may graduate faster.
* Full-time vs. part-time: Part-time students will take longer to graduate.
* Summer courses: Taking summer courses can shorten the time to graduation.
So while four years is the standard, it's not uncommon for it to take slightly longer or, less frequently, slightly shorter.