My son has athletic and academic scholarships.
For the academic scholarship he must maintain at least a 3.0 gpa so the academic $ don't count against the baseball team. The academic money is for 4 years as long as he maintains the gpa. If he wasn't an athlete the required GPA would only be 2.0 to keep academic scholly.
The baseball scholarship is renewed yearly. Some coaches may tell you during recruiting that the bb $ is for 4 years. But there are really no guarantees!
He also has a couple of outside academic scholarships that he earned due to high school GPA. These must go through the financial aid office and be approved by the NCAA compliance officer to verify they meet NCAA requirements.
And I can't state how difficult it may be (depending on major) to maintain a 3.0 in college. It's not like high school (even with AP classes). Much more difficult in college while playing a sport.