How many letters does the top answer for “a college or university building containing living quarters for students” have?

The most common answer is dorm (4 letters).

Crossword clue: a college or university building containing living quarters for students

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

dorm 4 letters wn-def

a college or university building containing living quarters for students

dormitory 9 letters wn-def

a college or university building containing living quarters for students