At a private college, you're more likely to graduate in 4 years.
John Belushi in Animal House
Years ago, viewers laughed at the thought of 7 years of college, but it's not quite so funny now. 5 years of undergraduate study is now common. A 5th year is less likely at a private college (64% of students at a private college graduate in 4 years vs. 37% at public universities).
When selecting and comparing colleges, check out collegeresults.org. CRO draws on a comprehensive national database (IPEDs); every U.S. college is required by law to provide student data. Be sure to select 4-year data, which is much more valuable than the 6-year data.