I'm usually able to finish a 10 episode jdrama within 24 hrs if it's particularly good. If I'm not really feeling it, it will take longer than a day, but not usually more than 2 or 3 days.
I'm able to finish a 16 - 24 episode kdrama within 2 - 4 days. Again depending on how engaging I find it. Kdramas usually take several episodes (5 or more) to hook me so a lot of time is usually wasted at the beginning of a drama. When I feel bored or the drama is slow to build I take frequent breaks. Once I'm hooked, though, I finish the drama pretty quickly. Longer dramas, 30 eps or more, take about a week to finish.
Taiwanese dramas sometimes follow the same trajectory as kdramas, but will usually take me about a week or more. I have not yet encountered the t-drama that has compelled me to marathon it.