Do no underestimate the importance of investing in yourself.  A valuable lesson that I learned from Tony Phillips is that spend some time each day doing what you love and increasing your development - this is not in conflict with you work, but in harmony with it.

One of my colleagues is has always been relentlessly disciplined in the time she devotes each day to research and keeping up to date with key industry news, and that investment pays immense dividends to both her knowledge and success and the success of the business.   I think she is an example to us all.  

How much better will you feel about yourself and perform in your job if you nurture yourself and spend time on things that you enjoy and have a passion for.  A good analogy is with the first rule of first aid, look after yourself first, otherwise there may be two casualties to deal with.