"Fewer than 40 percent of students enrolling for the first time at a four-year college actually graduate in four years. Even allowing an extra two years for financial challenges or new majors, fewer than two-thirds graduate within six years."
or
More than 60% won't graduate in four years. "The 6-year graduation rate for first-time, full-time undergraduate students who began seeking a bachelor's degree at a 4-year degree-granting institution in fall 2009 was 59 percent. That is, 59 percent had completed a bachelor's degree by 2015 at the same institution where they started in 2009. The 6-year graduation rate was 59 percent at public institutions, 66 percent at private nonprofit institutions, and 23 percent at private for-profit institutions."  https://nces.ed.gov/fastfacts/display.asp?id=40

30% of enrolling college freshman won't make through their first year.  https://www.collegeatlas.org/college-dropout.html