user: Question: How long was the Great Manchester Run?
Columns: ['Road race', 'Distance', 'Location', 'Country', 'Month held']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Xiamen International Marathon', 'Marathon', 'Xiamen', 'China', 'January']
SQL:

assistant: SELECT "Distance" FROM "Table" WHERE "Road race" = 'Great Manchester Run';