A brief, but powerful statement from E.M. Bounds–a man who knew something about personal piety.
Our devotions are not measured by the clock, but time is of their essence. The ability to wait and stay and press belongs essentially to our intercourse with God. Hurry, everywhere unseeming and damaging, is so to an alarming extent in the great business of communion with God. Short devotions are the bane of deep piety. Calmness, grasp, strength, are never the companions of hurry. Short devotions deplete spiritual vigor, arrest spiritual progress, sap spiritual foundations, blight the root and bloom of spiritual life. They are the prolific source of backsliding, the sure indication of a superficial piety; they deceive, blight, rot the seed, and impoverish the soil (E.M. Bounds, Power Through Prayer).