How Long Does ESA Last? March 11th, 2021 Each ESA letter is valid for 12 months after you obtain them from a certified health professional. After one year, you will have to renew your support animal letter. Related Posts What is the Cleanest Pet to Own? Getting a Certified Emotional Support Animal Can Your Dog Be Mad at You? Man’s Best Friend [therapypet_step1_form show_in_mobile="1"]