Time waits for no teacher. Pretty sure that's how it goes. Anyway a 5 Minute Classroom Sand Timer is a great resource for when you're trying to teach the complex concept of time to children. The sand in the timer provides pupils with a visual practical and concrete representation of time.Use the 5 Minute Classroom Sand Timer to teach time and understand 'duration'.Hone problem solving reasoning and cooperative skills using a Sand Timer for school to time group tasks.Explore the world before time was indicated by wrist watches smart phones and clocks.