Final exit from ksa

Dear Sir,
Please let me know if employer applies for my final exit visa from KSA how much time it will take to get it done? Will they give any paper of final exit visa? And they are asking for my iqama and original passport, is it required? Moreover how i can check that they have not put any ban on my re entry on another job in KSA in future? Is it really possible that if someone going with all clear background they may put ban on entry? How to check it?
Please answer as soon as possible..

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