Work and Fulfullment

I have recently began my working career, and I am struggling with the long working days that seem to bring me very little fulfillment and happiness. Throughout the working day I often feel empty and most days this feeling comes home with me. I have committed myself to a take on journey to spiritual enlightenment, but find it hard to stay on track while I am at work. I have found that my long days at my desk job often drain the spiritual progress I have made out of me. I know that I will soon make a large life change and leave this job, but until I can do that, what are some exercises I can practice while at work to make my day feel more fulfilling?