I'm in week two of my six week job and one thing that has really helped is cooking in bulk on my days off. I make breakfast before we leave and also make hubby lunch to take with him (we get a free buffet lunch at work so my mid-day meal is taken care of), then come home and cook dinner.
Needless to say, I am not much in the mood to cook in the early morning and am not so enthusiastic about cooking when I get home after a long day either. So, when I last made waffles I made a big stack and froze them which makes a quick breakfast, ditto pancakes. Oatmeal is pretty quick to cook, and I boiled a bunch of potatoes which also makes a good, quick breakfast. I made a big pot of chili and froze most of it which has made a quick, hearty dinner this week, ditto making baked falafel which can be thrown together to make a simple gyros for dinner. I also make a giant salad at the beginning of the week and that provides salad a couple days a week, it can also be used to make tacos, and the above mentioned gyros. I love ther versatility of multi-purpose food!
If you find your work week super busy, I highly recommend prepping food ahead of time, pre-planning meals, and cooking extra to put in the freezer which all help you pull together quick, healthy meals when you are pressed for time.