Continuity

to a point where one is very tired and has no more energy to keep on

They keep running until they drop, training for the upcoming marathon.

through the whole life span of a person

We must strive to provide quality education from cradle to grave.

to have a long history or past relationship with someone or something

The company and its suppliers go back a long way, with a history of collaboration.

in a way that is very regular or precisely as planned

The train arrives at the station like clockwork every morning at 8:00 a.m.

non-stop and continuing through the whole day and night

The customer service hotline operates around the clock to assist customers at any time.

something that cannot continue to work or make progress without stops or interruptions

The project is progressing in fits and starts, with periods of intense activity followed by long periods of stagnation.

happening or done on a daily basis

He goes to the gym day in, day out, never missing a workout.