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 is the Herzing University school code for FAFSA? How much does the Herzing LPN to ASN program cost? What does a medical assistant do? Can you become a surgical tech online?