How many letters does the top answer for “the quality of being intent and concentrated” have?

The most common answer is engrossment (11 letters).

Crossword clue: the quality of being intent and concentrated

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

engrossment 11 letters wn-def

the quality of being intent and concentrated

intentness 10 letters wn-def

the quality of being intent and concentrated