Please give an extension of leave for three days.

请准予续假三天为盼。

youdao

For three days last week, it was inadvisable to leave the harbour.

在上周的三天里，离开该港口是不明智的。

《柯林斯英汉双解大词典》

We were there for three days and while by the end I was desperate to leave, I was concerned that it seemed he didn't get it.

我们在那呆了三天最后我迫切地想逃离。我担心他并没有理解。

youdao

Three months for bereavement leave is a more realistic standard than three days, according to Cacciatore.

CNN: Father's campaign: More time off for grieving parents

The average bereavement leave for a person who loses a child is three days, according to Dr. Joanne Cacciatore, a researcher at Arizona State University and the founder of the MISS Foundation, which provides support to grieving families.

CNN: Father's campaign: More time off for grieving parents