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 Do I have to be a CNA before an LPN? Can data analysts work remotely? Do BSN nurses make more than ASN nurses? How much does the paramedic to BSN program cost?