How long does take to become a e8 marines with a 4 yr degree?

To become an E-8 in the U.S. Marine Corps, which is the rank of Master Sergeant or First Sergeant, a service member typically needs to have at least 16 years of service, regardless of educational background. Holding a four-year degree can enhance promotion opportunities and leadership potential, but it does not significantly reduce the time required to reach this rank. Promotions are based on a combination of time in service, performance, and availability of positions. Therefore, while a degree may be beneficial, the pathway to E-8 primarily depends on experience and service time.