Some graffiti signatures (which were used to form this puzzle's four longest answers)

Question:

Answer:

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String of letters found in this puzzle's longest Across answers
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Three-letter combinations hidden in this puzzle's six other longest answers
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Workweek start, or an apt title for this puzzle based on an abbreviation found in its five longest answers
A different one is hidden in each of this puzzle's seven longest answers
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Instantly ... or how this puzzle's other three longest answers came about?
Resort hidden in the five longest puzzle answers
Boat lifters found in this puzzle's three longest answers
A type of one appears in each part of this puzzle's longest answers
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