How many waiting months will the dependents be able to come to Riyadh?

Hi,my husband had a job offer from riyadh school. included in the offer is visa for the family but he has to go first then after few months we will follow. I would like to know how many months is the waiting period for the family members to come to riyadh? we are making plans since we are expats as well living in abu dhabi and will be travelling back to our home country with 3 kids. any inputs will be greatly appreciated. thanks.