Some of my friends will freak out if I don't text back in as little as 5 minutes. A particular needy friend once tried to get me to "promise" that I would always return her texts within 10 minutes.
I said "hard no" explaining that it meant that it meant that I could never watch a movie uninterrupted, read a book, take a nap, etc. Also, Driving. I don't answer texts while I'm driving because I literally got in an accident texting (it was a freak circumstance, but these things do happen).
I have purposefully started training my friends by being erratic with my texts/messages/e-mails.
I have another friend who always calls on his commute home and gets offended when I don't answer. The idea alone that someone is obligated to answer the phone is insane. What if I don't want to spend an hour shooting the shit with you because I'm doing something else?
I miss the days when I could just walk away from contact.