Hello,
As per the official, The Insured Person shall be, an Employee as defined in the ESI Act., and you should have been in continuous insurable employment for a minimum period of five/ Four/ three years. You can can check the further information related with the given below link on the page No. 13.
https://www.esic.nic.in/attachments/admissionfile/1d06c2921abdf89aefb556da2f4bb6c8.pdf
Good Luck!
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