The Herzing OTA associate degree program takes an average of 24 months to complete. That means depending on when you start and how quickly you earn your certification (passing the NBCOT exam), you may be able to become a Certified Occupational Therapist Assistant (COTA) in 2 years. Learn more about the Herzing OTA program Explore Now Other Questions What are the main differences between an LPN and RN? What jobs can I get with a health science degree? What does a physical therapist assistant do? Am I too old to start learning programming?