user: Question: What is the most rnd for Watkins Glen?
Columns: ['Rnd', 'Circuit', 'GTP Winning Team', 'Lights Winning Team', 'GTO Winning Team', 'GTU Winning Team', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Daytona', "#8 Henn's Swap Shop", '#93 Mid-O Racing', '#65 Roush Protofab', '#71 Team Highball', 'Results']
SQL:

assistant: SELECT MAX("Rnd") FROM "Table" WHERE "Circuit" = 'Watkins Glen';