How many letters does the top answer for “all of the living human inhabitants of the earth” have?

The most common answer is humankind (9 letters).

Crossword clue: all of the living human inhabitants of the earth

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

humankind 9 letters wn-def

all of the living human inhabitants of the earth

mankind 7 letters wn-def

all of the living human inhabitants of the earth