If you have one thing to do for the day, it will take all day. If you have three things to do for the day, you'll get all three done. If you have twelve things to get done for the day, you might not get all twelve done, but probably will get nine completed. See, having a lot to do creates a healthy sense of pressure on us and we almost automatically become better time managers. Prioritize your list.
Some items are more important, others less so.
A simple numerical listing will suffice. Dr. Donald E. Wetmore is a professional speaker and the owner of the Productivity Institute.