4 out of 10 kids who start a four year degree don't finish in 6 years.

Also, “four year” graduation rate can sometimes mislead. For example, Florida public universities require most students to take at least one summer term, even if they would otherwise complete their degrees in 8 semesters. But graduating in four years usually means 8 semesters plus a summer term of college costs, rather than 8 semesters.