How long does it take for a leg fracture to heal in a healthy 40 year old male?

1-4 months, varies: This depends widely depending on the exact location of the fracture, which bones (tibia or fibula) are involved, the degree of displacement of the fracture, bone quality, alignment of the fracture, treatment choice, and what your definition of "healing" is. You should ask your orthopedic specialist what they predict for your recovery. You may feel fine long before the bone is actually healed.