Everyone has different preferences, and I find it interesting. I typically stay an hour after school, tops, to get ready for the next day. I NEVER plan during the week. I just can't do it. I do all my planning on Sunday. I will sometimes grade papers during the week, but that's typically only around the time grades are due for report cards/prog reports, or I want the kids to have immediate feedback for some reason. All my papers get graded within one week because I send home Monday folders to parents. One teacher I know does 95% of her planning during the day while the kids are doing something independent. I couldn't plan in bits and pieces like that!