The degree certificate from Anna University is issued in a convocation ceremony. This ceremony is usually held 7-9 months after the results of the final semester are announced. The maximum period is 1 year within which you definitely get your certificate.
It depends on when the degree certificate reaches your college. Usually, the convocation ceremony takes place in April, March, or February.
You receive your course completion certificate right after your final semester. But to get your provisional certificate, you may need to wait for 3–4 months.