What is the ruling on a traveler availing themselves of the concessions of breaking the fast and shortening the prayer when moving between several cities with varying durations of stay in each, and what is the ruling on the days when they are not traveling, and what is the ruling on weekly holiday days?

A traveler is permitted to break their fast in Ramadan and avail themselves of the concessions for travel, unless they intend to reside for four full days in one place. If they intend to stay for less than that, they are still considered a traveler. If they enter a place for a purpose without specifying the duration of their stay, they may avail themselves of the concessions for travel, even if the period extends. As for vacation days, one must fast them if they are not traveling. If they are traveling, they may fast them, and fasting is preferable if it does not cause hardship. Fasting on Saturday or Sunday is not disliked if it is an obligatory fast or has a reason, such as the day of Arafah or Ashura. What is disliked is singling out Saturday or Sunday for a supererogatory fast that has no specific reason.