Guild Wars 2

Sometimes i cant see the remaining duration of a boon on an enemy (no moving bar around it and no time showen when moving the mouse over it), this can be pretty annoying when you want to burst but have no idea when the enemies protection or stability ends.
Im not sure whether that happens with allies as well since i dont look at their boons that much and im also not sure whether it happens with conditions.

I have noticed this as well sometimes in combat, there will be no timer bar surrounding a boon.