How many letters does the top answer for “a large and hurried swallow” have?

The most common answer is gulp (4 letters).

Crossword clue: a large and hurried swallow

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

gulp 4 letters wn-def

to swallow hurriedly or greedily or in one draught

swig 4 letters wn-def

a large and hurried swallow