One of the most common mistakes people make at the office is not turning to-do lists into time-bound, effective project lists. I've found that people who have mastered this hack are far more likely to deliver tasks on time.

It's simple: For each of the big things on your list, block off the amount of time on your calendar that you estimate the task might take -- and then add 33% more time just to be sure.

If a project is multi-day or has dependencies, break it up into digestible chunks. Use one block to plan and a second or third block to accomplish.

This simple method will help hold you accountable and immediately help you refocus on the tasks you've prioritized when you do get distracted. Too often, we let one distraction steamroll an entire morning -- now you don't have to let that client email derail you from your winning plan for the day.