User blog comment:EliteMadness/Custom Champion - Vane/@comment-38393713-20190218075248/@comment-4091261-20190219164127

That's a very short duration. The natural reaction to seeing a trap being layed is to avoid it like the plague. I'm certain that if the enemies see you drop one mid-combat, they are going to just bail or go even further beyond its range.

Even if it's dropped in a hidden area, it creates too great a sense of urgency to start a fight. I strongly believe the trap should at least last 20 seconds. An ultimate trap that can be wasted due to the enemy dawdling for 10 seconds is going to feel horrible playing with.