Leave with wages is a provision provided to employees that allows them to take a certain number of days off from work while still receiving their regular wages. The number of days an employee is entitled to leave with wages in a month depends on certain conditions and is determined by the applicable labor laws or employment contract.

Conditions for Leave with Wages:
- The employee must have completed a certain period of continuous service with the employer. This period may vary depending on the labor laws or employment contract. For example, in some countries, employees become eligible for leave with wages after completing one year of continuous service.
- The employee must have worked for a certain number of days in the month. This condition is important to prevent employees from taking leave with wages without fulfilling their work responsibilities. The specific number of days required may vary based on the labor laws or employment contract.

Calculating the Number of Days in a Month:
To determine the number of days an employee needs to work in a month to be eligible for leave with wages, the following steps can be followed:
1. Identify the total number of working days in the month. This includes all weekdays excluding weekends and public holidays.
2. Subtract any authorized leave days taken by the employee during the month. These may include sick leave, annual leave, or any other leave sanctioned by the employer.
3. Subtract any days on which the employee was absent without proper justification or permission.
4. The remaining number of days represents the minimum requirement for an employee to be eligible for leave with wages in that month.

Example:
Let's consider an example to understand this better. Suppose a company follows a 5-day workweek (Monday to Friday) and the month has a total of 22 working days (after excluding weekends and public holidays). In this case, if the employment contract specifies that an employee needs to work at least 15 days in a month to be eligible for leave with wages, the calculation would be as follows:
- Total working days in the month: 22
- Authorized leave days taken: 3
- Absent days without justification: 1

So, the employee has worked for 18 days (22 - 3 - 1) in the month, which is more than the required 15 days. Therefore, the employee is eligible for leave with wages.

Conclusion:
Leave with wages is allowed for employees if they meet the required conditions set by the labor laws or employment contract. The number of days an employee needs to work in a month to be eligible for leave with wages varies based on these conditions. It is important for both employees and employers to understand and adhere to these requirements to ensure fair and compliant leave policies are in place.