user: Question: How many viewers in millions watched the episode 23:55 minutes long?
Columns: ['Episode', 'Broadcast date', 'Run time', 'Viewers (in millions)', 'Archive']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['" Episode One "', '30September1967', '24:15', '6.3', 'Only stills and/or fragments exist']
SQL:

assistant: SELECT "Viewers (in millions)" FROM "Table" WHERE "Run time" = '23:55';