After a torn ACL/MCL and knee surgery, it took over 2 years for the damaged nerve between the knee and the foot to heal completely. That was about 350 millimeters, so maybe 1/2 mm per day of healing? I was in my 40's then, and thought it would never be OK.
After 2 hip replacements and 3 revisions in a period of 5 years, ending 12 years ago, I thought the burning would never go away, but it finally did after 2 years or so, all except 2 spots that alternate between being numb and painful, one on the outside of each thigh.

If the femur pain continues after 2 years, in your shoes I would be pushing for further imaging and testing. It could be failure of the rod and bone to graft fully, cement failure if it was used, evidence that the bone did not heal , microfractures in the femur or the sign of a metal allergy.

If you can find the exact name of the femur implant used (it should be in your surgical record) you can Google to see if problems have been reported with that specific device.