How many years of voyages did James cook?

James Cook undertook three major voyages of exploration between 1768 and 1779. His first voyage lasted from 1768 to 1771, the second from 1772 to 1775, and the third from 1776 until his death in 1779. In total, Cook spent about 11 years at sea during these expeditions, significantly contributing to the mapping and understanding of the Pacific region.