Over what timescale do stars in a typical open cluster form,relative to each other?

Name: Over what timescale do stars in a typical open cluster form,relative to each other?
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Stars in a typical open cluster form over a timescale of millions of years, with the more massive stars forming first and the lower mass stars forming later. This process occurs through gravitational collapse of a molecular cloud, which can take millions of years to fully collapse and form stars.

Over What Timescale Do Stars in a Typical Open Cluster