Hi had an interview today, which seemed to go really well. Lasted over an hour, they were happy with my work examples, they seemed to like my answers. Before I left, they said they would like me to do some homework for them to see what my writing style is like. They said to send it back to them asap. I didn't ask whether this would be via email, as I presumed it would be. The interview was at 11am this morning, it is now 7pm. I sent them an email a few hours ago, thanking them for their time and checking this would be through email and that I didn't forget to take a paper home with me, hoping this would get some response. I have received nothing in response. I know I am coming across as very eager,as I really want this job. Am I being too stressy about this, or is there likely an issue that is preventing them from going ahead with me?