Micro-Retention

A stream is not monetized or registered as a positive algorithmic signal until the 30-second mark.

The Pre-Chorus Shift

Data indicates that tracks introducing a novel sonic element (a vocal chop, a bass sweep, or a drum fill) between 0:15 and 0:25 have a 40% higher chance of crossing the 30-second threshold.

See Intro Length Penalty for more context on long builds.