The Human Genome Project officially took 13 years, running from its launch in 1990 to its declared completion in 2003. The project was originally designed as a 15-year undertaking, so it finished earlier than scheduled.
The HGP was formally established in 1990 after years of planning and technical development. Researchers pursued two linked goals: constructing genetic and physical maps of human chromosomes, and determining the DNA sequence across the genome. Its scale required international coordination, major sequencing centers, improved automation, and powerful computational tools.
A rough draft was announced in 2000, and draft sequence papers were published in 2001. Those achievements did not end the project. Scientists continued improving accuracy, closing gaps, and finishing the planned reference sequence until the completion announcement on April 14, 2003.
The 13-year figure refers to the official project period, not every effort to make the human genome more complete. Follow-up work continued afterward, and modern projects later resolved repetitive regions that the original HGP technologies could not fully sequence.