Hi.
Everyone heals differently. Take some time to bounce around this website and read the experiences of others. I know I have gained a lot from doing that.
Typically, casting is done for about 4-6 weeks. The ability to get back on your feet will depend on how much you work at it, so physical therapy is something you may want to consider.
I am sorry to hear your doctor did not give you much information! I think if it were me I would be contacting that doc and asking for some information.