vacant hour

If no farther than to a point equivalent to our eleven o'clock, A.M., in what way is the vacant hour between that point and sexta, or noon, accounted for by Martial?

From Notes and Queries, Vol. IV, Number 102, October 11, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Various

“In my next vacant hour, following the one devoted to Lafelle, I want to see Reverend Darius Borwell,” he directed.

From Carmen Ariza by Charles Francis Stocking

Is the true end of poetry to occupy a vacant hour?

From The History of Roman Literature From the earliest period to the death of Marcus Aurelius by Charles Thomas Cruttwell

In academies, and private families, it may be erected in the place allotted for amusement, where it will furnish entertainment for many a vacant hour.

From Practical Education, Volume II by Maria Edgeworth

You do not always find a successful Q.C. at his ease among his books, beneath the electric light, ready to give up a vacant hour to friendly colloquy.

From Hilda Wade, a Woman with Tenacity of Purpose by Grant Allen