As mentioned in Communication Rules - the instructor will reply in most cases from email questions within 24 hours. Weekends may take longer to respond.
Quizzes are automatically graded - so you will see your grades immediately.
Discussions are normally graded within a week. Grades will be posted under the "Grades" tab.
Both individual and team projects could take up to 2 weeks to grade - final team project will be graded within a week. After grading, the instructor will post grades under the "grades" tab.