'Day and Night' in the Bible

He also took off his [royal] robes [and armor] and prophesied before Samuel and lay down naked all that day and night. So they say, “Is Saul also among the prophets?”

They were a wall around us, both day and night, the entire time we were herding the sheep.

Saul quickly fell full length on the ground and was very afraid because of Samuel's words. He was completely drained of energy, not having eaten anything all that day and night.