1.NounThe perception of time being tied to experience: time flying by, time dragging slowly.
2.NounA system by which intervals are measured by actions or emotions in a commercial for research purposes.
"Instead of selecting an image for testing every 0.2 seconds, the new research team used a subjective time approach, selecting an image to represent each significant change in the ad, no matter how fast or slow the ad’s edits may be."