Short Answer

Since there is no way to verify when the authorities of Hajj slaughtered your animal, you may assume that it was done in the morning on the 10th of Dhul Ḥijjah since that is when they begin slaughtering animals. There are millions of animals being slaughtered and due to the excessive difficulty this places on slaughterhouses, you don’t have to wait to exit the state of iḥrām until several days later.

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Shaykh Mustafa Umar