"Towel"

Translation: 수건

[CF00l]

手巾

[BarAdal3]

Please note that this word is supposed to be pronounced like [수:건], so the first syllable is longer

[pluureng]

As of 2012, long vowels are already obsolete in Korean, except for a few older speakers in Seoul.

[BarAdal3]

Do you mean that 사건 is not pronounced [사껀] anymore? Because that is the pronounciation I see in Naver dict when I look that word up.

Now, I know this isn't the same as long vowels per se, but this was what I meant with my comment nonetheless.

[pluureng]

I mean long vowels, not double consonants.