There isn't currently a hard and fast rule about working hours, duties, etc, but the same article does say:

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A standard format for the work contracts of housemaids would be agreed upon with the countries concerned “to adopt indisputable and clear clauses that guarantee the rights of both parties, the maid and the employer”.

Al-Rayis said that discussions had been going on with other GCC countries to approve a form of standard unified employment contract for maids. “The process is still in the negotiation stage.”

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Maybe in this new contract the issue of working hours, a day off, etc, will be legally settled?