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- 1 day leave for every 20 days of work. For the calculation of working days all festival holidays and Casual leaves and sick leaves are counted as working day.
You may also refer to the Shops and establishments act of your state but more or less the provision for PL are almost same.
To be entitled for encashment or availing the PLs or earned leaves an employees must have completed atleast a year (generally companies take one year of service ) or 240 days as per law. But it depends on the company if it wants to be liberal to the employees and gives the entitlement of availing PLs right from the first month. Many companies have merged all the leaves and they use to give 2.5 leaves every month right from the first month altogether. But every company has to give the minimum of leaves as per the provisions of the corresponding applicable Act.
Amit Goyal