Originally Posted by sicklyman
you should check that there is no restriction on when they must enter. They may have to enter within 90 days after the visa is granted.
This is also my understanding:
Once issued - they have to use it within three months.
Once in KSA, the length of stay is usually fixed, 30/60/90 days.
Don't apply for it too early if they are coming in May. I'd suggest start the process around mid March time.