待在外面很晚是一个常见的情况，特别是在周末或假期，人们有时会熬夜，玩得很晚。在英语中，有一些短语可以用来描述这种情况。

首先是 "stay out late"，意思是待在外面很晚。例如：

- I stayed out late with my friends last night and didn't get home until midnight.

- She always stays out late on the weekends, partying with her friends.

另一个常见的短语是 "burn the midnight oil"，意思是熬夜工作或学习。例如：

- I had to burn the midnight oil to finish my essay before the deadline.

- He's been burning the midnight oil studying for his exams.

还有一个短语是 "party until the wee hours"，意思是熬夜聚会或玩乐。例如：

- They partied until the wee hours of the morning, dancing and drinking.

- We stayed up until the wee hours playing board games and chatting.

总之，待在外面很晚是很普遍的现象，人们可以用 "stay out late"、"burn the midnight oil"、"party until the wee hours" 等短语来描述这种情况。