My company is sending me in straight duty like 48...

The UAE labor law has set the basic working hours as 48 hours per week, and the employer can compel the worker to work overtime, and the employer must pay the worker an additional wage for the number of overtime and if the overtime hours that the worker performed at night are from 9 pm to 4 am, the worker shall be entitled to the additional time determined for the normal working hours, plus an increase of not less than 50% of that wage.
Here is the text of the UAE Labor Law, related to your inquiry:
Article (67)
If the working conditions call for the employee to work more than the normal working hours, the period of increase is considered an additional time for which the worker receives a wage equal to the wage corresponding to the normal working hours, plus an increase of not less than 25% of that wage.
Article (68)
If the working conditions require that the workers work an additional time between nine o'clock in the evening and four o'clock in the morning, the worker shall be entitled to the extra time determined for the normal working hours, plus an increase of not less than 50% of that wage.