Sam Ewing said "It's not the hours you put into your work, it is the work that you put into the hours"
Successful people have the ability to focus. They know what their objectives are, how to achieve them and then get on it with it!
If you find that you are not achieving what you want to despite the long hours then take 5 minutes and look at what you have been working upon during the day. Long hours lead to a lack of focus, and tiredness. Tiredness leads you then to not be able to work to your optimum, you take more breaks - a quick gossip, a few more coffees, longer meetings etc
Focus is key so proudly on your table put your personal objectives.....then each day look at your commitments and ensure that they are achieving your objectives.