The concept in this book is one we have followed for quite a while. Laura Vanderkam explains that instead of planning your tasks to fit each day equally, think of your tasks as fitting evenly into a week or month bucket.
Having a clock with more information only allows you to stay more productive. It allows you to set a timer to keep yourself on track while completing tasks.
Be sure to add time estimates to your tasks when writing your to-do list or scheduling your day. Take it a step further and enter tasks as blocks of time in your calendar; think of them as appointments with yourself.