Considering that an employee has to complete 48 to 50 hours of work in a week, which means 8 hours * 6 days = 48 hours. In a month, there are 30 to 31 days, including 4 Sundays. However, there is no law that specifies wages must be paid for 26 days or 30 days.
It totally depends on the company or factory and how they choose to handle it. Companies often pay salaries based on 30 days because employees sometimes work for more than 8 hours a day without receiving extra pay. This is typically for official work. However, in labor-intensive jobs, payment is based on the number of hours and days worked. Therefore, many contractors pay wages for 26 days.
I hope this clarifies your doubts.