Why length matters in a playlist
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A playlist's overall length genuinely shapes how it ends up being experienced, with a shorter set inviting close, attentive listening from start to finish, while a considerably longer one tends to function more as background across a much more extended stretch of time, a distinction worth deciding on before a single song is actually chosen.
Matching length to purpose is genuinely essential here, and a playlist built specifically for a short commute needs a tighter, more deliberate arc than one meant to run largely unattended through an entire afternoon spent working on something else entirely, mismatching length and purpose is one of the more common curation mistakes.
Overly long playlists risk losing real coherence over time, since it becomes considerably harder to maintain a single consistent thread across so many songs, which is exactly why even fairly generous playlists often benefit from having some kind of clear internal structure, a structure that gives even a very long set a genuine sense of shape.