In the audiobook version, Galt’s speech lasts about 3 hours or so.
The typical response will be TL; DR
(Too Long, Didn’t Read)
I own the hardcover edition of Atlas Shrugged. "This is John Galt Speaking is my absolute favorite part of it.
I've read AS three times over the years. I still cheer Galt's speech, all 58 pages of it.