Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What it Duration, when Test Flight is Free Flight #3?

### Inputs:
table_name: table, columns: ['Test flight', 'Date', 'Speed', 'Altitude', 'Crew', 'Duration', 'Comment']

### Response:
SELECT Duration FROM table WHERE Test flight = free flight #3