Is establishing a condition for specific service by the husband to the wife as Mahr valid?

Primary text

If the service required of the husband is quantifiable and known, such as serving for a specific period, the condition is valid. If the service is indefinite and cannot be precisely measured, the contract is invalid, and the wife is entitled to her proper Mahr (Mahr al-Mithl). This interpretation resolves a noted ambiguity regarding a wife who owns property but cannot manage it herself.