How many letters does the top answer for “a quality proceeding from feelings of affection or love” have?

The most common answer is affectionateness (16 letters).

Crossword clue: a quality proceeding from feelings of affection or love

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

affectionateness 16 letters wn-def

a quality proceeding from feelings of affection or love

lovingness 10 letters wn-def

a quality proceeding from feelings of affection or love

feeling or showing love and affection 50% similar → loving