Here's the thing on jobs: it is cool to pour yourself in to something and succeed. It feels great. That said, keep your eyes on what you want several yrs from now.
What I am getting at is that you can work 12hrs a day and kick ass and stuff and get promoted and everything and that is fine, but promotions come based on what your employer thinks you can do going forward given your work habits. So if you work 12 hrs a day to get that job, that same level of dedication will be expected of you once you have that job, if not more. At no point, that I am aware of, do you finally get to a point where you have been promoted to a job where you get to back down to a level of effort less than what you gave to get that job.
I probably described this poorly, but be aware. When setting the world on fire, you have to keep feeding the flames otherwise they will burn your ass up.
So fast forward to where you want to be in several yrs. Does that point in your life still give you room to put as much emphasis on your job then as you are talking about doing now? Wife, kids, soccer and tball games, etc. All that crap takes time. Lots of it, and future you needs to be aware of the hole that present you may be digging.
