user: Question: What is the class of the Budweiser Grand Prix of Miami race with a length of 3 Hours?
Columns: ['Race', 'Length', 'Class', 'Circuit', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['24 Hour Pepsi Challenge', '24 Hours', 'All', 'Daytona International Speedway', 'February 5 February 6']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Race" = 'Budweiser Grand Prix of Miami' AND "Length" = '3 Hours';