How hard is the recovery for ankle fracture surgery?

Moderate. Depending on the fracture shape, usually screws, maybe a plate are used to reduce and stabilize the fracture. Most are placed in a cast or minimally an orthoboot, on crutches for 4-8 weeks. If torn ligaments are involved it may add a couple of weeks. It is dependant on the type of fracture you have.
Depends. Difficult to predict there are variety of factors to consider. Severity of the fracture, involvement or not of the joint surface, how well it was fixed and any other problems associated locally or in general health of the individual. In general it takes about 6 to 12 weeks for bones to heal and motion and function to start returning to normal.