How to study Hanon?

Hi everyone, any of you have a plan to study progresively Hanon exercises? I want to improve my technique and i want to play again the Hanon Studies. The other times i have study them i feel really frustrated. I have seen so many videos of people talking about study the exercises with different rythms, tempos etc. What is your trick? Recently i read one post that says that you need to study each of them 1 hour before change to other. What are you insights?

Thanks a lot.