How many letters does the top answer for “a bet that you can pick the first and second finishers in the right order” have?

The most common answer is exacta (6 letters).

Crossword clue: a bet that you can pick the first and second finishers in the right order

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

exacta 6 letters wn-def

a bet that you can pick the first and second finishers in the right order

perfecta 8 letters wn-def

a bet that you can pick the first and second finishers in the right order