Get extra sleep. Animals which hibernate live longer.
Track the returns on your investment regularly. This will help you not to fall in love with your current job.
Make sure you exaggerate your work to your manager. Its important to sell yourself in real world. Forget about honesty and idealism at work.
Go to work with the thought as to how your manager will try to take advantage of you today and plan for escape route accordingly. This should be long term goal.
Never never ever let anyone sense that you are free at work at any point of time. Always appear busy. Walk around with a diary and a pen, never empty handed. Use the 4 letter word more often when you are at your desk so that other notice how busy you are.
Never accept any task at least 40 minutes before end of day. Respect your time.
Always pretend to be concerned about any problems at work, even if you don't have any stake at it.