When you receive an invitation to dinner, is it polite to save your host money by leaving before dessert? No. By default it will be rude and it would be up to you to find a nice way to do so.
Likewise I feel if an interview is scheduled for all day and you accept the invitation, then it's up to you to apologise if you want to leave early. So long as you explain that you don't want to waste their time, then no one should be narkey about it. But if you make it sound like you don't want to waste your time, then I think they have a right to be a little miffed at you.
When you receive an invitation to dinner, is it polite to save your host money by leaving before dessert? No. By default it will be rude and it would be up to you to find a nice way to do so.
Likewise I feel if an interview is scheduled for all day and you accept the invitation, then it's up to you to apologise if you want to leave early. So long as you explain that you don't want to waste their time, then no one should be narkey about it. But if you make it sound like you don't want to waste your time, then I think they have a right to be a little miffed at you.