user: Question: How many episodes were directed by Michael McCullers?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Pilot "', 'Greg Daniels', 'Greg Daniels & Michael Schur', 'April9,2009', '6.77']
SQL:

assistant: SELECT COUNT("Original air date") FROM "Table" WHERE "Directed by" = 'Michael McCullers';