It is determined by the policies of the organisation. On the last day of employment, many companies send a relieving letter. Many companies provide a resignation acceptance letter on the last day of employment and an experience letter once the F&F is completed, which is usually depending on the company policy.
It will usually take 7- 30 days from the date of your resignation to get your relieving letter incase of Canara HSBC OBC Life Insurance. You can write an email to the organistation for the same.