It is difficult to reply to your question- (1) without actually seeing the appointment orders, (2) without knowing the rules of the University, (3) without knowing on what basis the selection was made for such ad hoc appointment, (4) without knowing whether it was based on some competitive examination, (5) without knowing whether such ad hoc appointment was made in accordance with rules and whether the candidate was eligible and whether other similarly situated eligible candidates were considered, etc.
Generally speaking, ad hoc appointments are considered to be back door entry and courts usually deprecate the regularisation and absorption of persons working on ad hoc basis as it has become a common method of allowing back door entries. But, it all depends on facts of each case.
The answer to your question depends on facts of the case. Please show your relevant documents to some local lawyer and obtain his opinion. Since you appear to be working for a long period of about 9 years, it may go in your favour if other factors are also in your favour.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.