Kēxuéjiāmen féngāo-jìguǐ, zhōngyú wánchéng le zhè xiàng yánjiū.
The scientists worked day and night and finally finished the research.
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From 韩愈's 《进学解》, which pictures a scholar who "burns lamp oil to carry on the daylight, toiling year after year". 膏 is lamp oil and 晷 the sundial, so the daylight it measures.
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Literary. In speech people say 夜以继日 "night after day" or 开夜车 "to pull an all-nighter".
