@Moon ****
I will be applying for the DTV on the 26th. So far, I first applied for a tourism visa (I need one even to visit, I'm not Korean). I first applied on a Sunday. Then, next Wed. they asked me to upload some documents. I did that same day on the evening, and they checked them and approved the visa on the next week Wednesday. However I do know some Korean nationals who have got their DTV approved within a day or two (my guess is they applied on a Monday or so). Reportedly, it's faster if you upload everything at once. I don't know which subdivision are you applying for, but, for example, if you it as a freelancer, submitting a link for your online portafolio (or offline, depending on what you do) helps a lot.