Why Does Staccato Have No Single Fixed Length?

A staccato dot tells the performer that separation should be audible between notes, but it does not prescribe that every note must be reduced to one half or one quarter of its written value. Its rhythmic position remains unchanged: a crotchet still occupies a crotchet's span, although part of that span becomes silence after the sound ends. The real decision is how long the sound remains and what the resulting space does.

The same four staccato notes can require different lengths. In a slow bass register, notes cut too short may leave only percussive attacks and remove the harmonic ground. In a quick high register, notes held too long may join together. Staccato in a Classical rondo may need lightness and forward direction, while a Romantic bass accompaniment may retain enough weight for the harmony to stand. Because piano sound also decays naturally, perceived length depends on the release, clarity of attack and any remaining pedal resonance.

Staccato does not simply mean throwing the wrist upwards. Release may come from the finger, forearm or larger arm movement, provided it does not disrupt preparation for the next note. If shortness becomes the only aim, each sound can turn into an isolated tap. When the pulse of the whole phrase is heard first, well-judged air between notes can strengthen continuity. The useful question is not what fraction of the written value remains, but whether the space clarifies rhythm and character while preserving the phrase's direction.

https://human.libretexts.org/Bookshelves/Music/Music_Theory/Understanding_Basic_Music_Theory_(Schmidt-Jones)/03%3A_Notation_-_Style/3.02%3A_Articulation
https://human.libretexts.org/Bookshelves/Music/Music_Theory/Open_Music_Theory_2e_(Gotham_et_al.)/01%3A_Fundamentals/1.07%3A_Other_Aspects_of_Notation