
On end
Time Span
Indicates a considerable amount of time spent on an activity without taking a break.

I read the entire novel for six hours on end.
Emphasizing Duration
Accentuates the length of an activity to emphasize endurance or boredom.

She waited for the train for hours on end.
Hyperbolic
Sometimes used exaggeratively to stress continuous action, not necessarily literal.

The baby cried for hours on end last night.
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