How many days need to issue qatar work visa

Dear all,
                 i got a job in qatar also signed offer letter. Two week before PRO told to me  my work visa will aprove qatar ministry. So i ask my visa copy. He told me next week will send you. But still i didn't receve anything. My doubt is once qatar ministry visa aprove how many days need to issue the visa.   Waiting for your reply.

Hi
as far as I know max. 3 working days