So a book written by David Beckham is good proposition. I try to work on writing or research at any rate 1-2 evenings a week, and much less 3-4 hours on the weekend. In fact, I even produced weather station with a 5th grade class as the student pro. http://Pasarinko.zeroweb.kr/bbs/board.php?bo_table=notice&wr_id=3329899