How many letters does the top answer for “the time after sunset and before sunrise while it is dark outside” have?

The most common answer is night (5 letters).

Crossword clue: the time after sunset and before sunrise while it is dark outside

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

night 5 letters wn-def

the time after sunset and before sunrise while it is dark outside

nighttime 9 letters wn-def

the time after sunset and before sunrise while it is dark outside