How much time does it take for the Special Marriage Act?

Hello, My boyfriend is from India and I am from Bangladesh. We both are want to marry in special marriage act our religion is Hindu. Now how long time it will be to complete the marriage whole process. And after marriage am I able to get the citizenship in India. When I can get the citizenship .I completed my bachelor's and master's from India. It is easy to get the citizenship. And how I will get my visa after marriages. and after marry can I do my study continuously or job?.