How long did it take to build the Queen Mary 2?

The Queen Mary 2 took approximately three years to build, with construction starting in 2002 and finishing in 2004. The ship was officially launched on March 21, 2003, and entered service on January 12, 2004. Built by the French shipyard Chantiers de l'Atlantique, she was the largest and longest ocean liner ever constructed at the time.