When is the one who is constantly traveling required to fast?

Question : If someone were to say, “These are sailors or taxi drivers who are always traveling, so if we tell you that you are travelers and may break your fast, when do they fast?”

Answer : We say that they can fast during the winter days. So we grant them a dispensation and say, “Fast during the winter days, because they are short and cold, and fasting in them is not burdensome.” Likewise, if they happen to arrive in their home country during Ramadan, they are required to fast as long as they are in their home country. If they arrive during Ramadan, they are required to fast.