Use 'on and on' to express something that's been happening for a very long time and feels too lengthy.

Time Duration

'On and on' often implies that the speaker finds the ongoing action annoying or tiring.

Negative Nuance

Emphasizes the lack of interruption or pauses in the action, as if it flows continuously.

Describes continuous movement in a certain direction, often without a clear endpoint.

Can imply traveling a long distance, stressing the extent of the journey.

When used in context of efforts or actions, it highlights determination and continuing without giving up.