Evolution of a 5 solar mass star. The blue path is called a "track" on the H-R diagram. The star takes about 200 million years to evolve from point 1 to point 2, but less than a 1 million years to evolve from point 5 to point 6, and about 20 million years to evolve from point 6 to point 7. From Astronomy 162, by the University of Tennessee.