user: Question: How often are there ads during American Top 40?
Columns: ['Time', 'Show Name', 'Local/Networked', 'Ad Freq', 'News Freq']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['6:00am–9:00am', "Truckin' With Tim", 'Networked', '20 Minutes', '60 Minutes']
SQL:

assistant: SELECT "Ad Freq" FROM "Table" WHERE "Show Name" = 'American Top 40';