It is better for workers to hasten to pray when they hear the adhaan
Question

                Is it better for workers to hasten to pray when they hear the adhaan, or to wait until they have finished some tasks? What is the ruling on offering naafil prayers after praying, apart from the regular Sunnah prayers?.
Praise be to Allah.
    It is better for all Muslims to hasten to pray when they hear 
    the adhaan, because the muezzin says, “Hayya ‘ala al-salaah (Come to 
    prayer).” Hesitating will lead to missing the prayer. 
With regard to a worker 
    offering naafil prayers after the prayer, apart from the regular Sunnah 
    prayers, this is not permissible, because his time belongs to someone else, 
    according to the work contract. With regard to the regular Sunnah prayers, 
    there is nothing wrong with him offering them, because bosses and 
    supervisors customarily allow that. 

    And Allaah is the Source of strength.