What is the approximate main sequence lifetime of a $2.47 M_{ ext{odot}}$ star?
Answer
500 million years
The duration a star spends on the main sequence is inversely related to its initial mass; heavier stars consume their core fuel much more rapidly than solar-mass stars. A star with an initial mass of roughly $2.47$ solar masses burns through its hydrogen reserves considerably quicker than the Sun. Consequently, its stable main sequence existence is dramatically shortened to only about 500 million years before the fuel depletion causes the core balance to tip toward gravity, forcing the star to move into its post-main sequence evolutionary path.
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