How many letters does the top answer for “an occasion for excessive eating or drinking” have?

The most common answer is binge (5 letters).

Crossword clue: an occasion for excessive eating or drinking

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

binge 5 letters wn-def

an occasion for excessive eating or drinking

bust 4 letters wn-def

ruin completely

suffering from excessive eating or drinking 60% similar → crapulent