Is there any informal/formal phrase/idiom said to Sb who's been doing Sth or just has finished doing Sth meaning "I hope you're not tired!"? (other than "good job", "well done") Say your teacher has just finished the class, you go to him to ask a question, and you need to tell him Sth meaning "hope you're not tired!"..................thanks. (in BrE please...)
And, how about "good stuff!"? Is it too informal?