In my experience if you can absolutely focus on getting one thing done, you can get it done really fast. Now Harvard Business review has a nice article on this. Here are some useful suggestions from the article.

1. Do the most important thing first in the morning, preferably without interruption, for 60 to 90 minutes, with a clear start and stop time. If possible, work in a private space during this period, or with sound-reducing earphones. Finally, resist every impulse to distraction, knowing that you have a designated stopping point. The more absorbed you can get, the more productive you’ll be. When you’re done, take at least a few minutes to renew.

2. Establish regular, scheduled times to think more long term, creatively, or strategically. If you don’t, you’ll constantly succumb to the tyranny of the urgent. Also, find a different environment in which to do this activity — preferably one that’s relaxed and conducive to open-ended thinking.

3. Take real and regular vacations. Real means that when you’re off, you’re truly disconnecting from work. Regular means several times a year if possible, even if some are only two or three days added to a weekend. The research strongly suggests that you’ll be far healthier if you take all of your vacation time, and more productive overall.

Read the complete article.