How long does it take for a 1-M ? star to pass through the pre-main-sequence phase?

Name: How long does it take for a 1-M ? star to pass through the pre-main-sequence phase?
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It takes about 10 million years for a 1-M ε star to pass through the pre-main-sequence phase. During this phase, the star is still contracting and heating up until it reaches a temperature and density high enough to initiate nuclear fusion and become a main-sequence star.

How Long Does It Take for a 1-M ? Star