How many letters does the top answer for “the book fahrenheit 451 was written by whom” have?

The most common answer is bradbury (8 letters).

Crossword clue: the book fahrenheit 451 was written by whom

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

bradbury 8 letters otdb

United States writer of science fiction (born 1920)

ray 3 letters otdb

a column of light (as from a beacon)

a book in which the log is written 50% similar → logbook