for days on end

for days on end

For a long time, specifically many days. Ugh, we've been working on this project for days on end, and management just gave us another batch of changes to make.
See also: days, end, on
Farlex Dictionary of Idioms.

for days on end

Fig. for many days. We kept on traveling for days on end. Doctor, I've had this pain for days on end.
See also: days, end, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • days on end
  • end your days/life
  • end (one's) days
  • one of these days is none of these days
  • bygone
  • bygone days
  • days running
  • for (some) days running
  • days hence
  • days, weeks, etc. on end