How many letters does the top answer for “(of tempo) as fast as possible” have?

The most common answer is prestissimo (11 letters).

Crossword clue: (of tempo) as fast as possible

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

prestissimo 11 letters wn-def

(of tempo) as fast as possible

extremely fast; as fast as possible 50% similar → prestissimo

(of tempo) moderately fast 50% similar → andantino

(of tempo) very fast 50% similar → presto