What is the Sharia ruling regarding a husband who does not deal justly between his two wives in terms of division [of time], overnight stays, and financial support, and wishes to end the marriage because the wife demands justice?

A husband must be just between his two wives in terms of overnight stays and financial support. It is not permissible for him to withhold any of her rights for fear of his other wife finding out. It is the wife's right to demand justice and financial support from her husband. It is advisable to discuss this with the husband in a good manner, and if it is impossible to convince him, then the wife has the right to seek divorce, while weighing the benefit of divorce against staying.