The Sunnah is for the pilgrim to remain in Muzdalifah until it becomes light

Question: Is it the Sunnah for the pilgrim to stay until he prays the Duha prayer? Or does he depart immediately after the Fajr prayer from Muzdalifah?

Answer: The Sunnah is to remain in Muzdalifah until it becomes light, until the light becomes clear before the sun rises; this is the best. If he prays Fajr, he remains in his place facing the qiblah, making du'a, reciting the talbiyah, and remembering Allah until it becomes light, as the Prophet (peace and blessings be upon him) did.
As for the weak, they may depart after midnight. But whoever sits until it becomes light, prays Fajr there, and sits until it becomes light, calling upon Allah facing the qiblah, reciting the talbiyah, making du'a, and raising his hands, this is better, following the example of the Prophet (peace and blessings be upon him). He remained in Muzdalifah until it became light. When it became light, he departed to Mina before the sun rose, differing from the polytheists. They did not depart from Muzdalifah until the sun rose, and the Messenger (peace and blessings be upon him) differed from them and departed from Muzdalifah before the sun rose after it had become light. This is the Sunnah, following his example (peace and blessings be upon him).