Time period for issuing experience certificate in a government psu

In response to your query,

No, it is not mandatory for the government to issue an experience certificate, however if you want one you have to send a written request for the same to the state or central government.

Once a written request for the same is sent, with an explanation as to why you need it, the process of generating and granting the certificated will be done immediately however if there is a delay you should follow up this concern with the concerned authority or go to the parent company in person to seek relief.

In the meantime, in order to show proof, you could submit your relieving letter as well as your appointment letter or your salary slips.

In case of denial to provide the certificate even after repeated requests, then the last exhaustible option would be to sue the company to obtain the certificate.