change their shift i dont think if in a batch / shift there are 100 people all 100 are muslims, those who dont have any issue in working at that times you give them that slot. Also depends on peoples mentality and seriousness of how they take religion, i have seen many doctors , people working in sensitive posts taking the religion apart and doing their duty sincerely, ever seen a doctor in between operation or army person in duty taking time off for prayers. My post is not to hurt any religion or caste. But management really dont care about such things , especially companies who are at the mercy of uncle SAM .