in one long push

'Paul researches and outlines a report first, then tries to complete the writing in one long push over a weekend.'


Is the phrase in red ( in one long push) an idiom?

Does it literally mean 'to push a button for a minute'?

or... Is it metaphorically used in this sentence and mean 'to work on something without a rest'?

ㅡ.ㅡ'

The second one- 'to work on something without a rest'