on end

Related to on end: calling it a day

on end

Continuously and without stopping. Used after a unit of time, such as "hours" or "days." I could talk for hours on end about trains. Out in this part of the country, the wind howls for days on end.
See also: end, on
Farlex Dictionary of Idioms.

on end

Continuously, without interruption, as in It's been raining for days on end. This term, which might just as well be put "seemingly without end," dates from about 1300.
See also: end, on
The American Heritage® Dictionary of Idioms by Christine Ammer.

on end

1. Having one end down; upright: books placed on end on the shelf.
2. Without stopping: drove for hours on end.
See also: end, on
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • for hours on end
  • oil it
  • get off light
  • small hours
  • the small hours
  • the small hours (of the night/morning)
  • the wee small hours (of the night/morning)
  • get off lightly
  • get off/be let off lightly
  • wee hours