Whilst trying to prove to Kimmy (known to y'all as Suckmydee) that No Eul (of Rainbow) is actually quite beautiful, I stumbled across this video.
In the very beginning of the video, she sings what appears to be a shortened version of her part. No. Her involvement in the entire song is literally this x2 + an extra 2 seconds near the end. That totals to an approximation of 6 seconds. Which should be considered absolutely ridiculous, but instead, it's becoming a norm in Korea's pop scene.
So I leave you with this question (as well as the title): Which idol has the shortest singing time? (leave name + song).