Is it permissible to combine and shorten the prayers of Dhuhr and Asr, or Maghrib and Isha, due to the nature of a daily 8-hour work shift in a remote area 130 kilometers away from one's place of residence?

If a traveler travels daily to a place that is the distance for shortening prayers, and does not settle there, then he is permitted to avail himself of the concessions for travel, such as shortening and combining prayers. However, if he settles in that place for four days or more, the ruling of travel ceases, and he is no longer permitted to avail himself of those concessions.