By the end of Chapter 5 of The Hound of the Baskervilles by Arthur Conan Doyle, there is a usage that I have never seen before: "under the ten minutes".
The context:
Until we got three-quarters down Regent Street. Then my gentleman threw up the trap, and he cried that I should drive right away to Waterloo Station as hard as I could go. I whipped up the mare and we were there under the ten minutes.
Is "under the ten minutes" exactly the same as "under ten minutes"? Or do they have different shades of meanings?