How many letters does the top answer for “once in a while; on rare occasions.” have?

The most common answer is semioccasionally (16 letters).

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Crossword clue: once in a while; on rare occasions.

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

semioccasionally 16 letters web-def

Once in a while; on rare occasions. [Colloq. U. S.]

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)