I work in an office, and I have a colleague who rings his family in Egypt every day for about an hour. I work in a research environment at a university, and he's on skype so it doesn't cost money (and time isn't a big issue), but it's really hard to concentrate while he babbles away in arabic for an hour.
I know I'm not being unreasonable, but it's his only chance to ring his family because of the time difference.
The question really is how to handle this sensitively.