How long is six nights?

One night means one night, explanation: stay one night, so six nights is six nights.

Su is a polyphonic word, and different pronunciations have different meanings. Reading Si means staying overnight. In Shuo Wen Jie Zi, it says, "Sue, stop." It also refers to something that has always been there, such as an ancient wish; When reading "Xi incarnation", it is used to calculate the night; When you read Xi, it refers to the constellation.