Dependents final exit

I have 3 dependents.  two of the childrens have to face exam in march up to 30. Our iqama will expire on March 8 2018. I intended to go on April 10 2018 . If I make exit  visa only for my dependents on before 28 Feb and renew my iqama, then how many days my family can stay in Saudi . I am expecting beloved advise.

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