My dealer has ordered parts for my car. My car has been drivable the entire time, but it took several weeks to get one of the parts. It is easy to understand you missing your Karma. Feeling satisfied driving another car after driving a Karma can't be easy.
It really depends on what parts are needed .For parts like interior trim like sun visors it takes a few days I had to order new leather for the drivers seat that took over a month . I have a car in the body shop with over 8 grand worth of damage the parts haven't been ordered yet I will update this thread as parts are ordered and come in to give you a time frame .