How long will your sun remain a main sequence star?

Answer 1

When hydrogen in the core of the star is depleted, a balance no longer exists between pressure and gravity, with that the core contracts and temperature rises. This cause outer layers to cool and expand. In this late stage of the star's life cycle, it is called a giant. The sun will continue to be a main sequence for about 5 billion years, then the sun will become a giant.

Answer 2

Our sun is predicted to remain a main sequence star for another 5 billion years. At that point, it will exhaust its hydrogen fuel and start expanding into a red giant.