you should be given the option to choose your prefered time slot, usually from a few choices. for example, they may give you 2pm on Jan1 or 3PM on Jan 5, etc. So even if you have to be called during work, you will still know it ahead of time so you can (and should) make some arrangement, say get an empty office to answer the call, or get a few hours off work during that time. That said, the 12-hour time difference will very likely make the interview happen at night in China. To the admission folks, they do this every year, so it's just a job and I doubt they will be using their own time to do interviews unless they have to  |