How many letters does the top answer for “the quality of lacking any predictable order or plan” have?

The most common answer is haphazardness (13 letters).

Crossword clue: the quality of lacking any predictable order or plan

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

haphazardness 13 letters wn-def

the quality of lacking any predictable order or plan

randomness 10 letters wn-def

the quality of lacking any predictable order or plan