How does Daniel’s established prayer practice meet Darius’s decree?

Darius appoints 120 governors and three princes over them, including Daniel. Daniel excels because a greater spirit of God is in him, and the king thinks of setting him over the whole kingdom. The other officials can find no fault or suspicion against his faithful administration. They decide that his God's law may provide a charge. Their petition claims that all the officials have agreed: for thirty days anyone petitioning a god or man except the king must enter the lions' den. Darius signs the decree under the stated unalterable law of the Medes and Persians.

Knowing the law has been made, Daniel continues his established practice. At the open windows of his upper chamber toward Jerusalem he kneels three times daily, adores and gives thanks. The watchers find him praying, remind the king of his decree and accuse Daniel of disregarding it. Grieved, Darius labors until sunset to save him, but the officials insist that the law cannot be altered. Daniel is cast into the den. The king says that Daniel's God will deliver him; a stone closes the mouth, sealed with the king's and nobles' rings so nothing may be done against Daniel. Darius spends the night without supper and cannot sleep.

Early in the morning he hastens to the den and asks in a lamenting voice whether the living God has saved his servant. Daniel answers that God's angel shut the lions' mouths: justice was found in him before God, and he has done no offense before the king. Daniel is lifted out without hurt; the account attributes this to his belief in God. The accusers, their wives and children are cast in, and the lions seize them and break their bones before they reach the bottom. Darius writes to peoples, tribes and languages throughout the earth, wishing peace and directing reverence for Daniel's living, eternal God, whose kingdom cannot be destroyed and whose signs and deliverance are proclaimed. Daniel continues under Darius and Cyrus the Persian.