The Pomodoro technique has been used by many successful professionals for time management. You are going to need a timer to practice it though. Why buy one when you can build your own. Particle Pomodoro is an internet connected timer that logs your cycles to Google Sheets.
This NeoPixel powered IoT Pomodoro timer was made using a Particle Internet button. You can also use a magnetic buzzer to enhance its capability. More information about the project is available here.