@Anthony ******
any year long multi-entry Non-Immigrant type visa that you get from a consulate in another country can always be used to get 90 day stays for 15 months; as long as you bounce out and back in one last time before the visa itself expires to get the final 90 day stamp
I think you're talking about getting a yearly extension of stay inside the country at the immigration office, and in that case you're right they're issued for a year at a time.