I got only one thing to say, but it's the simplest and most powerful concept I have ever learnt: If you have 4 things to do, and you do them one after the other

I got only one thing to say, but it's the simplest and most powerful concept I have ever learnt: If you have 4 things to do, and you do them one after the other, you will be fastest than if you do them all at the same time. If each task takes 1 day to do, and you do all at once, you will deliver all in 4 days. If you do them one after the other, task 1 is done on day 1, task 2 on day 2, task 3 on day 3 and last task on day 4. So 3 of 4 tasks are delivered ahead of schedule.