The duration of Black Books is 1500.0 seconds.
The duration of Prospero's Books is 2.15 hours.
The duration of Black is... Black Ain't is 1.45 hours.
The duration of The Black Pirate is 1.57 hours.
The duration of Lady Black Rose is 1.2 hours.
The duration of The Learning Channel's Great Books is 3600.0 seconds.
The duration of The Black Six is 1.57 hours.
The duration of The Black Meteor is 1.78 hours.
The duration of Black Orpheus is 1.78 hours.
The duration of Black Litter is 1.48 hours.
The duration of Black Gravel is 1.85 hours.
The duration of The House Is Black is 1320.0 seconds.
The duration of Black Tights is 2.33 hours.