user: Question: What is the duration that has Pietro Genuardi as the actor?
Columns: ['Actor', 'Character', 'Soap Opera', 'Years', 'Duration']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Patrizio Rispo', 'Raffaele Giordano', 'Un posto al sole', '1996—', '18 years']
SQL:

assistant: SELECT "Duration" FROM "Table" WHERE "Actor" = 'Pietro Genuardi';