How can you stay completely focused on a task for hours?

As the quote says “FOCUS ON BEING PRODUCTIVE INSTEAD OF BUSY”.
Our lives are constantly being interrupted by notifications, computer screens, and social networks, and it is easy to whittle away the hours procrastinating.
As an entrepreneur, staying focused can be tough with a constant stream of employees, clients, emails, and phone calls demanding your attention. 
“A key strategy here is to focus on what makes you enjoy certain tasks and to harness that for tasks/chores you don’t enjoy as much.”
Some ‘Tricks’ you can try out:

• Start with the good stuff
• Make a to-do list
• Manage your time
• Multi-task less
• Avoid too much caffeine
• Staying Motivated

These are the certain things which you can try to do in order to have a longer and a better attention.