How many letters does the top answer for “the capability of quiet thought or contemplation” have?

The most common answer is reflectiveness (14 letters).

Crossword clue: the capability of quiet thought or contemplation

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

reflectiveness 14 letters wn-def

the capability of quiet thought or contemplation

reflectivity 12 letters wn-def

the capability of quiet thought or contemplation