My work takes up a lot of my time. Can I still take another wife even though my time is limited?

Fairness in the rota and in time is a condition, so if you already have no time for one family, adding another only magnifies the injustice. A wife has a right to your time and attention, not just to financial maintenance. If your work already leaves your existing family missing your presence, that is a clear sign polygyny is not suitable now. Fix your work–family balance first, and fulfil the rights you already owe. Time that is not enough to divide fairly is a strong reason to postpone or not go ahead. Ability is not only in your wallet, but also in the hours and the heart you can give. See conditions of polygyny.