Welcome! Best wishes on your path to donation. As the saying goes, your mileage may vary. I was still napping into my third week post op, though I went back to work, no heavy lifting, half days, after two weeks. I was 44, healthy, and fit. I had no immediate surgical complications. When you next speak to anyone at the transplant center, explicitly mention that you are concerned about this 4 week estimate when considering your standing and lifting requirements. Ask them what the contingency plan for treatment and lost wages is if they're incorrect about this estimate. Don't be surprised if they turn the question around and ask you, instead.
That answers your direct question, but the way you described your situation, I'm not sure you've been fully informed. On December 4th, 2014, the Kidney Allocation System for the US is going to change. Among the changes relevant to your situation, waiting time will be defined as starting from the first onset of dialysis treatment, not from the first time of being put on the list. Also, the new allocation system is explicitly intended to better match recipient and donor characteristics. No telling how much or how quickly this might reduce wait time for your father, but the transplant center should explain this in detail. You haven't said how old you and your father are, or any other details about your or his health. All these and much more should be carefully considered. Again, best wishes.