I wasn't able to finish a drama within a day yet, but I can finish a j-drama (10-12 ep) in 2 days if I have free time. And a k-drama (16-24 ep) in 3-5 days. But it needs to be really captivating ^^.
I don't think I've ever completed a full-length drama in two days. never mind one. I'm a person who needs way too many breaks in-between and if something can stop me from going on millions of breaks, it's pretty impressive to me.

I have completed a couple full-lengths in three days though and couple of shorts ones (Ma Boy!) in a day because well...it's easily possible.
LOL a drama a day keep worries at bay :p
Ej101 wrote: LOL a drama a day keep worries at bay :p

*lol* that's true I guess! There have been times when I've wanted to spend a whole day watching dramas, but I haven't done it yet. In general, the more I like a drama, the faster I watch it but it also means that I don't want it to end too quickly. If the drama has ten episodes, I can watch the first half of it in two days and then I spend a week on the second half. But it also depends on how much time I have.

I think that I don't watch more than four episodes in a day at most, usually less (four episodes of one drama or four different ones). The exception is Hana Yori Dango; I watched the first seasons in two days and I stayed up all night to finish it and begin the next season... but I didn't have time to marathon S2.
If I really, really, really like the drama - I go with dramathon (usually average length kdrama for a weekend) because I become obsessed with story and must finish it ASAP (cliffhangers are killing me), but if drama is average, my pace becomes slower... Some of my dramathon titles - The Greatest Love, Autumn's Concerto, Oh! My Lady, BoF, I Need a Romance, Que Sera, Sera, Queen In Hyun's Man, Reply 1997, Shut Up: Flower Boy Band, Soulmate, The Master's Sun, In Time With You, Buzzer Beat, Pride...