Is it permissible to combine the Maghrib and Isha prayers at the time of the Maghrib prayer, due to night work conditions in a busy hotel where it is difficult to perform the prayer on time?

The believer prioritizes Allah's command above all else, and prayer is the greatest pillar of the religion after monotheism. You must strive to perform prayers on time. If your workplace does not accommodate this, then you should seek another job. If you are compelled to stay in this job, continue until you find an alternative. In this situation, it is permissible for you to combine Maghrib and 'Isha prayers by performing them earlier (jama' taqdim) temporarily. It is not permissible to make combining prayers a continuous habit. Working in hotels that offer forbidden things, such as serving alcohol and the mixing of men and women, is not permissible, as it falls under aiding in sin and transgression.