user: Question: Which Combined elapsed time has a Skipper of Stephen Wilkins?
Columns: ['Overall place', 'Yacht name', 'Skipper', 'Points', 'Combined elapsed time']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'LG Flatron', 'Conrad Humphreys', '95', '171d 13h 33m 49s']
SQL:

assistant: SELECT "Combined elapsed time" FROM "Table" WHERE "Skipper" = 'Stephen Wilkins';