Hi,
As per the Factories Act, 1948, every worker who has worked for a period of 240 days or more in a factory during a calendar year shall be allowed, during the subsequent calendar year, leave with wages for a number of days calculated at the rate of one day leave for every 20 days of work. For the calculation of working days, all festival holidays, casual leaves, and sick leaves are counted as working days.
You may also refer to the Shops and Establishments Act of your state, but more or less, the provisions for PL are almost the same.
To be entitled to encashment or availing the PLs or earned leaves, an employee must have completed at least a year (generally companies require one year of service) or 240 days as per the law. However, it depends on the company if it wants to be liberal to the employees and give the entitlement of availing PLs right from the first month. Many companies have merged all the leaves and they give 2.5 leaves every month right from the first month altogether. But every company has to give a minimum number of leaves as per the provisions of the corresponding applicable Act.
Amit Goyal