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지 얼마나 됐죠

how long has it been since

→ 지
phrase Rare #16,402
how long has it been since Used to ask how much time has passed since an action or event. It usually follows a verb + 지 construction.
KO: 한국에 온 지 얼마나 됐죠?
EN: How long has it been since you came to Korea?

떠난 지 얼마나 됐죠?

How long has it been since you left?

— 엘 시크레토: 비밀의 눈동자 (2009)

집 나간 지 얼마나 됐죠?

How long has it been since you left home?

— 중앙역 (1998)

그럼 여동생이 실종된 지 얼마나 됐죠?

So how long has it been since your sister went missing?

— 싸이코 (1960)