Could Three Months Of Rehabilitation Sufficient Post Knee Replacement Surgery?

I have been advised to get a total right knee replacement but am unable to get hold of the appt nurse to schedule the surgery I only have 3months medical leave and want to be sure I am healthy I that time to return to,work once I can get hold of the appt nurse how long would it take to get the appt set up and will 3 months be enough for rehab