Is a husband who is unable to be fair in allotting nights between his two wives sinful, due to the long distance between them and his staying with one of them for his work and trade?

If the two wives are content with what the husband does, then there is no problem. But if they demand that the situation be rectified, then he must be just between them in terms of overnight stays and expenses, and divide the days between them equally, whether it be a day for a day, or three days for three days, or a week for a week, according to their agreement. This should be done while trying to keep their residences close to each other to facilitate his justice and the performance of his work.