When we manage our time to use it more wisely, we are practicing stewardship. God's WORD reminds us , "to redeem the times, for the days are evil". Stewardship is treating everything we have been given by God as a gift to bring Him praise. 

"Traditional approaches to time management deal with segmentation, prioritization, and the like; but the bigger question, when it comes to time management, is not the degree of practical efficency but the measure of spiritual effectiveness." From The Stewardship of Life; by Kirk Nowery.