user: Question: Name the length for stage of SS6
Columns: ['Stage', 'Time (EEST)', 'Name', 'Length', 'Winner', 'Rally leader']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['SS1', '19:00', 'SSS Hippodrome 1', '3.20km', 'M. Hirvonen', 'M. Hirvonen']
SQL:

assistant: SELECT "Length" FROM "Table" WHERE "Stage" = 'SS6';