Deadlines and time frames establish parameters, but typically not in a good way. The average person who is given two weeks to complete a task will instinctively adjust his effort so it actually takes two weeks. Forget deadlines, at least as a way to manage your activity. Tasks should only take as long as they need to take.
Do everything as quickly and effectively as you can. Then use your "free" time to get other things done just as quickly and effectively. Average people allow time to impose its will on them; remarkable people impose their will on their time.