Even to the time appointed— There seems nothing difficult in this passage, as some have supposed: the plain meaning appears to be, that the pestilence, commencing in the morning, continued even to the time appointed; i.e. even to the third day; when God, moved with the repentance of the king and his subjects, commanded the angel, 2 Samuel 24:16 to stay his hand, without continuing to destroy till the evening.
Related Commentaries of 2 Samuel 24:15
2 Samuel 24:15
15 So the LORD sent a pestilence upon Israel from the morning even to the time appointed: and there died of the people from Dan even to Beersheba seventy thousand men.