“How long has the Sun burned its hydrogen fuel approximately?”

"The Sun a main-sequence star has been burning its hydrogen fuel for approximately 4.6 billion years converting hydrogen into helium via nuclear fusion. This process generates the energy sustaining life on Earth. With half its fuel consumed the Sun is expected to continue for another 5 billion years. Understanding this 4.6 billion-year timeline highlights stellar evolution and its implications for planetary systems a key topic in astronomy and astrophysics."