How many letters does the top answer for “characterized by excessive precision and attention to trivial details” have?

The most common answer is pernickety (10 letters).

Crossword clue: characterized by excessive precision and attention to trivial details

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

pernickety 10 letters wn-def

characterized by excessive precision and attention to trivial details

persnickety 11 letters wn-def

characterized by excessive precision and attention to trivial details