How many letters does the top answer for “what are the three virtues of bionicle” have?

The most common answer is destiny (7 letters).

Crossword clue: what are the three virtues of bionicle

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

destiny 7 letters otdb

an event (or a course of events) that will inevitably happen in the future

duty 4 letters otdb

the social force that binds you to the courses of action demanded by that force

unity 5 letters otdb

an undivided or unbroken completeness or totality with nothing wanting