How many letters does the top answer for “an act intending or showing kindness and good will” have?

The most common answer is benefaction (11 letters).

Crossword clue: an act intending or showing kindness and good will

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

benefaction 11 letters wn-def

an act intending or showing kindness and good will

benevolence 11 letters wn-def

an act intending or showing kindness and good will