Every suggestion now shows the video’s length.

This sounds small and it changes the whole interaction. The question you are actually answering when a suggestion comes up is not “is this interesting” — it is “do I have time for this right now”. Without a duration you could not answer it without opening the video on YouTube, and once you are on YouTube, the thing RandomYV exists to help you avoid has already happened.

The length shows on the thumbnail, in the same place YouTube puts it. Forty minutes when you have fifteen is an immediate Next, and that decision now costs one glance instead of a round trip.

It also makes the app usable in a way it was not before: you can go looking for something that fits a specific gap — a short one over lunch, a long one for a train ride — by pressing Next until the number is right.