The Hour That Changes the World:

The Hour That Changes the World, first published by Baker in 1978, is a classic book on prayer that offers practical suggestions on how readers can revitalize their prayer lives. Dick Eastman challenges Christians to spend one hour each day in prayer, and he outlines a twelve-step prayer program to help them accomplish the task.
By dividing one hour into twelve five-minute points of focus, such as praise, waiting, confession, and Scripture praying, believers will develop a more consistent habit of daily prayer. The Hour That Changes the World draws heavily on Scripture and classic devotional writers and includes an appendix titled Scriptural Intercession.
This 25th anniversary edition features a new introduction by Eastman and a new foreword by Joni Eareckson Tada, in which she writes: The Hour That Changes the World may appear small and modest, but don’t let its size fool you. Full of biblical insights about prayer, packed with testimonies of prayer warriors from years past, brimming with practical suggestions that will help you carve out a purposeful time of praise and intercession, Dick Eastman’s book is arguably the most significant book on prayer written in modern times.