Korean Grammar In Use – Beginning – English Version page 155 about 동안.
얼마 동안 한국에 있을 거예요?
How long will you be in Korea?
3년 동안 있을 거예요.
For three years.
I listened to the audio file from the CD and I thought… hey… the narrator pronounced 얼마 동안 as [얼마똥안]! I always thought that it was pronounced [eol-ma dong-an] but it was clearly pronounced as [eol-ma-ttong-an].
So I asked my Korean teacher, Google 선생님, and found my answer here: http://www.korean.arts.ubc.ca/b_tb/tb_09/L9-1-1.htm.
얼마 동안? = [for] how long? Note the pronunciation: [얼마똥안].
Ooo… 좋은 걸 배웠어요.😀 ###