I'm a workaholic it seems normal for me to work 12-13 hours a day every day and drink my way through the evening, while working of course!
I did that for a lot of years. When you are very productive on the job it's hard to see that you may have a drinking problem.
The problem is, you can't keep this up forever. As the years go by your tolerance will increase and your body's ability to recover from the nightly abuse will decrease. Eventually, those trend lines will intersect and you will crash and burn.