Approximately how long does the sequence from initial dense core to a stable, Sun-sized main-sequence star take?

Answer

Roughly half a million years

The entire sequence required for the object to stabilize as a main-sequence star, balancing gravity with fusion energy, takes approximately half a million years for a star comparable in size to our Sun.

Approximately how long does the sequence from initial dense core to a stable, Sun-sized main-sequence star take?
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