There is this saying: "Do what you like, and you won't have to work a single day of your life".

If we don't feel motivated, we will certainly get bored with the tasks we are working on, BUT if we look for a funny way to do those "boring" things, we will actually enjoy it, creativity is key.

On the other hand, the timing is pretty important; Pomodoro is a technique I personally would recommend to use. Basically, this technique consists in a timer that will provide you with a certain amount of time to do tasks, and a certain amount of time to have fun. Most successful people I know use it, or use something similar. In my case, I set my time by watching the clock, it depends on individual tastes.