An expression to ask or state when something happened or how long ago
When to use
Asking elapsed time, Talking about duration of experience, Checking someone's status
The nuance
Use verb past tense + -(으)ㄴ지 + '알아요' to ask or state elapsed time since an event. Example: '한국에 온 지 얼마나 됐는지 알아요?'.
