How many letters does the top answer for “the sport of riding a surfboard toward the shore on the crest of a wave” have?

The most common answer is surfboarding (12 letters).

Crossword clue: the sport of riding a surfboard toward the shore on the crest of a wave

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

surfboarding 12 letters wn-def

the sport of riding a surfboard toward the shore on the crest of a wave

surfing 7 letters wn-def

the sport of riding a surfboard toward the shore on the crest of a wave