user: Question: How long were Ray Bradbury and his wife married?
Columns: ['Name', 'Deceased Spouse', 'Cause of Death', 'Date of Spouses Death', 'Length of Marriage', 'Children Together', 'Current Marital Status']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Samuel Beckett', 'Suzanne Déchevaux-Dumesnil', 'Unknown', 'July 17, 1989 (aged89)', '28 years', 'None', 'Deceased (1989)']
SQL:

assistant: SELECT "Length of Marriage" FROM "Table" WHERE "Name" = 'Ray Bradbury';