Hello Shailendra,

Your question is a bit vague. If you want to know how many times you would have to visit the campus for completion of Admission procedure then first after having cleared the exam and getting a call ,you will have to visit the Pravesh Bhavan on the given date, if your documents are up to date and you pay the fee in the same day then it's just one day process. Later you need to get enrolled in the three departments you got as your subjects. This may take a couple of weeks as the official works are very slow and frustrating, and the authorities are rude and irresponsible. Once you are done with enrollment, you have completed the admission procedure. 

Another interpretation of your question may be that you want to know how many days a person has to attend the college after admission. Well if you get the main campus. People usually disappear after enrollment and suddenly appear in the exams. Since AU has annual exam system instead of semester system, and no minimum attendance requirements, students tend to not attend the classes for even a period (literally!)..

I hope I have answered your question. If still in doubt, comment.