Financial aid policies vary wildly from college to college. Even if you have a $0 family contribution (EFC per Fafsa), that does NOT mean you will have full financial aid to cover your college costs…even for one year.
You would be eligible for Direct Loans of $5500 freshman, $6500 sophomore, $7500 junior, and $7500 senior years.
You might receive a Pell Grant or part of it if your FAFSA EFC is less than $5000. You can get that for the equivalent of six years in college as an undergrad.
Some schools have SEOG which would be four years IF your get it…no guarantees. Your state might also have need based aid.
Usually need based aid awarded by the colleges is for four years only…merit aid too. So if it took you longer to complete a bachelors, then you would need to fund it some other way.
But the reality is…the vast majority of colleges do not meet full financial need.