Typically, the 90 hours window for the week is divided into work and personal time. The failure and success of personal time management relies heavily on these. When work time is mixed with the personal time and vice versa, negative repercussions happen. The two can really not be mixed. Otherwise the body will interpret leisure time mixed with work as work and tasks mixed with leisure will still be work that leaves one exhausted and stressed and in extreme cases lowers down the body functions that makes one prone to illnesses. One of its best advantages aside from costs and comfort is that it can be learned at the reader's own pace. Good skills are learned that way, a little at a time. The greatest thing that goes against it however is the lack of physical interaction. Another is the language, the amount of dedication that one could have in reading a book. Time and Attendance management can deliver hourly or real time data of productivity to decision makers enabling them to monitor and have better time control and management data from their offices. It allows managers to decide immediately to increase use of time and resources that can raise profitability where and as it is needed. Increase satisfaction People who have effective management skills are recognized for the good contributors that they are and are richly rewarded because management is always on the lookout for people who have proven discipline paths that can be replicated. Reduces stress Often it is not the amount of work done but the amount of work that is yet to be done that causes stress. The things that you think is not really needed immediately and not important can be done as the day wore on and if you have the time. Assign work time frames for each. Assigning work time frames for each task, even if it is not so realistic at first can give you a good idea later on regarding the a more realistic approach. If you use your time well during class, you would not be reviewing as much and those are hours added to your personal time. - What you control then out of the 168 hours is 60. Use it well. Many students will want to use that to improve their standing in class. And so they will devote time to studying more.