Reels in the 21-34 second band hold the highest median reach (n=950 Reels, binned)

Reels in the 21-34 second band hold the highest median reach (n=950 Reels, binned)

Median reach indexed to the 7-15s band:

— 7-15s: ████ 100%
— 16-20s: █████ 118%
— 21-34s: ██████ 131%
— 35-60s: ████ 96%
— 60s+: ███ 81%

Sub-15s clips finish before they accumulate enough watch-seconds to signal quality. Past 35s, completion drops faster than added seconds compensate.

So what: the efficient frontier sits near the half-minute mark. Pad a strong 12-second idea to ~24 seconds with a second beat before cutting it short.