The duration of the CC ability is displayed as a cooldown timer on top of your character.
Shows how the mod works with a CooldownCount-type mod installed (in this case, OmniCC).
In this shot you can see a few of the other debuffs that are affecting the character. LoseControl only displays the icon of the CC debuff with the longest duration remaining (oh noes, I'm feared while sheeped, how long til I can move again?)
LoseControl in demo mode showing party, target, and focus icons.