user: Question: What is Time, when Method is "Submission (knees)"?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '16–11–1', 'Forrest Griffin', 'Decision (unanimous)', 'UFC 148', 3.0, '5:00', 'Las Vegas, Nevada, United States']
SQL:

assistant: SELECT "Time" FROM "Table" WHERE "Method" = 'Submission (knees)';