Ok, say some guy has 3 hexes on him. Now a monk casts remove hex on him. Which one is removed first? Is it 1) the one that's been on him the longest, 2) the one that has been on him the shortest amount of time, or 3) is it random.
It's the one that is the newest. If you want to keep a hex on somebody just cover it up with another hex, or two. Will take them longer to remove the one they really want to get rid of.