* Type of institution: Students at four-year colleges are less likely to graduate in three years than those at two-year colleges (where it's more common). Even within four-year colleges, graduation rates vary widely between private and public institutions, as well as by size and selectivity.
* Major: Some majors require more coursework and may take longer to complete. Engineering or pre-med, for instance, often extend beyond three years.
* Full-time vs. part-time status: Students attending full-time are far more likely to graduate in a timely manner.
* Student demographics: Factors like socioeconomic background and first-generation college status can impact graduation rates and timelines.
While some institutions might publish data on 3-year graduation rates, a national average isn't readily available and wouldn't be very meaningful due to the significant variability mentioned above. You'd need to look at specific college or university data to find the 3-year graduation rate for that particular institution.