How long will it take for your femur to heal if its been broken?

Depends. Femur fractures can be difficult. Depends on age and type and location of fracture. Some have to have a rod placed down the bone, some are plated, some are casted (pending age) and some are even more complicated. Bone heals in 4-6 weeks. Femur fractures may take longer. It may be shorter. Discuss with your orthopedist and stay in close contact and communication. "break a leg" and heal fast".
Typically 12 weeks. Typically 12 weeks, but everyone is different. Things like nicotine, nutrition, etc all come into play as well.