user: Question: If the winner is Bernhard Eisel, what is the stage maximum?
Columns: ['Stage', 'Winner', 'General classification', 'Mountains classification', 'Points classification', 'Sprints classification', 'Team classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Fabian Cancellara', 'Fabian Cancellara', 'no award', 'Fabian Cancellara', 'no award', 'Team Saxo Bank']
SQL:

assistant: SELECT MAX("Stage") FROM "Table" WHERE "Winner" = 'Bernhard Eisel';