Jacob either did equally divide the times between his two wives; or rather, had more estranged himself from Leah, and cohabited principally with Rachel, which occasioned the foregoing expostulation.
Related Commentaries of Genesis 30:15
Genesis 30:15
15 And she said unto her, Is it a small matter that thou hast taken my husband? and wouldest thou take away my son's mandrakes also? And Rachel said, Therefore he shall lie with thee to night for thy son's mandrakes.