Productivity gurus of all sorts, ranging from Merlin Mann to the Flylady (aka Marla Cilley) recommend using a timer.
Pomodoro,
named for a tomato-shaped kitchen timer and based on working for 25
minutes with 5 minute breaks and a longer break every four sessions.
The key here is to promise yourself that when your 25 minutes is up, you
can walk away and do something else. Do a little bit of work, get a
little bit of reward. Even 25 minutes a day will help you see some
progress and get out of the procrastination cycle. It increase your focus when you feel scattered, to break through distraction and to help ensure that you’re making
progress on the things that really matter to you.
Cf. software programs with timers and stopwatches for Windows:
Mostrar mensagens com a etiqueta workflow. Mostrar todas as mensagens
Mostrar mensagens com a etiqueta workflow. Mostrar todas as mensagens