user: Question: How long was the Instrumental version in 1986?
Columns: ['Version', 'Length', 'Album', 'Remixed by', 'Year']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Album version', '3:49', 'Cendres de Lune', 'Laurent Boutonnat', 1986.0]
SQL:

assistant: SELECT "Length" FROM "Table" WHERE "Year" = 1986.0 AND "Version" = 'Instrumental';