First of all Congratulations!!!! I am having my surgery on the 4th of March. I am scared and excited as well... I was told by my surgeon's office that it could be as few as 2 weeks or 6 weeks it will depend on me.. I do have a desk job, and can also get my walking in walking to the bathroom because it is far away...
Since your job is a bit more physical than mine... I would defiantly lean towards 4 weeks if you can... like some of the other post have pointed out, not only is there the possibility of dealing with pain, but there is also the fatigue and the mental part that comes alone with it...