user: Question: Name the total number of length minutes for number in series for 17
Columns: ['No. in series', 'No. Disc', 'Title', 'Directed by', 'Written by', 'Original air date', 'Length (minutes)']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Pilot', 1.0, '" Children of the Gods "', 'Mario Azzopardi', 'Jonathan Glassner & Brad Wright', 'July27,1997 ( Showtime )', 95.0]
SQL:

assistant: SELECT SUM("Length (minutes)") FROM "Table" WHERE "No. in series" = '17';