The duration of the treatment cannot be suggested without having a clinical look at the case and evaluation of the current condition of your teeth. The number of teeth that require rectification as well as replacement and whether root canal treatment or any filling is required for any teeth will be the deciding factors for the duration of the treatment. And the cost of the treatment will also vary according to the materials and the procedures involved. The crowns used for replacements are of various types depending upon their quality and the warranty certificates and can range from 2000 rupees to 25000 rupees per crown. Please consult your dentist for a detailed discussion regarding the treatment plan. Regards.