user: Question: On the episode that had a run time of 24:57, how many million viewers were there?
Columns: ['Episode', 'Broadcast date', 'Run time', 'Viewers (in millions)', 'Archive']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['" Part One "', '15December1973', '24:15', '8.7', 'PAL 2" colour videotape']
SQL:

assistant: SELECT "Viewers (in millions)" FROM "Table" WHERE "Run time" = '24:57';