How many letters does the top answer for “the rays of the sun” have?

The most common answer is sunlight (8 letters).

Crossword clue: the rays of the sun

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

sunlight 8 letters wn-def

the rays of the sun

sunshine 8 letters wn-def

the rays of the sun

exposure to the rays of the sun 67% similar → solarisation, solarization