user: Question: What was great britain's total time?
Columns: ['Rank', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'real']
Sample row: [1.0, 4.0, 'Geoff Huegill', 'Australia', 51.96]
SQL:

assistant: SELECT SUM("Time") FROM "Table" WHERE "Nationality" = 'great britain';