Q: I’m generally a very busy person and often I don’t have enough time to reply straight away to e-mails I receive from family/friends. So, my question is what is the polite response time to family/friends – or to put it another way, after what period of time does it become rude to not have replied?
A: An email should be replied to in less than a week. If it will take you longer than a week to reply, a simple message saying something like “I got your email, I’ve been really busy but I want to catch up with you, I’ll email you back as soon as I get a moment ” would be fine. It acknowledges you have received the email, so the sender won’t be wondering whether maybe they had the wrong address for you, or there was some other delivery problem.