It depends on the relevant rules / guidelines applicable in your organisation. You have to check these relevant rules / guidelines which are applicable to you.
For example, for the Central Government employees (these may also generally to organisations under the central government), the relevant guidelines in this regard are as under:
“The decision whether an employee should be confirmed or his probation extended should be taken soon after the expiry of the initial probationary period, that is within six to eight weeks, and communicated to the employee together with the reasons in case of extension. A probationer who is not making satisfactory progress or who shows himself to be inadequate for the service in any way should be informed of his shortcomings well before the expiry of the original probationary period so that he can make special efforts at self-improvement.”
This may imply that within 6 to 8 weeks of the expiry of the probation period, a decision to extend the probation may be communicated.
You can read these and other relevant guidelines with regard to confirmation of probation at this link.
However, as I mentioned above, you have to check what are the guidelines applicable in your organisation.
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.