2 sentences

1. 他经常通宵达旦地工作。

   tā jīng​cháng tōng​xiāo​dá​dàn de gōng​zuò.

   He often works through the night until dawn.

   Source: Dong Chinese Dictionary

2. 由于工作任务紧迫，他经常通宵达旦地加班。

   yóu​yú gōng​zuò rèn​wu jǐn​pò, tā jīng​cháng tōng​xiāo​dá​dàn de jiā​bān.

   Due to urgent work tasks, he often works through the night until dawn.

   Source: Dong Chinese Dictionary