How many letters does the top answer for “correct and valid reasoning” have?

The most common answer is logicality (10 letters).

Crossword clue: correct and valid reasoning

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

logicality 10 letters wn-def

correct and valid reasoning

logicalness 11 letters wn-def

correct and valid reasoning