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 programExplore Now Other Questions Is a bachelor’s degree in healthcare administration worth it? How much does a software developer make? Practical nursing vs. medical assisting: what's the difference? What is the role of a primary care nurse practitioner?