When a publisher says you need to approve copy edits within 48 hours, it's perfectly fine to say "No, I'll get back to you in a couple weeks."
Don't ever ever ever give up your free time for a non-existent deadline.
When a publisher says you need to approve copy edits within 48 hours, it's perfectly fine to say "No, I'll get back to you in a couple weeks."
Don't ever ever ever give up your free time for a non-existent deadline.