at a sitting , at one sitting
youdao
He would stay for hours at a stretch in the laboratory.
他能一连几个小时呆在实验室里。
Today I really swam to my heart's content. I did 3,000 metres at a stretch.
今天我一口气游了三千米，真过瘾。
《新英汉大辞典》
The woman had to travel overseas once a month for three or four exhausting days at a stretch.
FORBES: When You Just Don't Fit In At The Office
Like most nannies, though, the virtual babysitter will work for only eight hours or so at a stretch.
ECONOMIST: For the child who has everything | The
Which is not bad, if you don't mind being cooped up in a boat for weeks at a stretch.
ECONOMIST: The shrimping industry
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