When you are at starting point in your career, you worked long hours without taking care of your health. Even you work long hours to give your best when you don't want to work. This all you do to be on top in your company and get rewarded. Theirs comes a point when you get the momentum, then you get the tipping point. This is the best time you takes a break.Once the company takes off, you will be there to support the company.
But, if your health is not good by doing the hard work by long working hours, then you risk seeing the impact of long working hours on the company's growth, which is not more productive and successful. You will be likely to see results like angry colleagues, broken family relationships, bad health. Yours working long hours may disturb yours co-workers and make them to get against you. Colleagues will start hating you. As you are making them look bad in their work process time.
The effects of long working hours on productivity are bad upon a time.
It's not necessary to work long hours. It is necessary to work smartly.