Possibility of Parents Departure for KSA on Different Dates

My parents have submitted their KSA Visit Visa documents at Etimad Visa Service Centre.ISB Both had their names on same electronic visa slip and In Shaa Allah expect to get visas stamped on their respective passports in next 7-10 days.

I need to ask that Is it compulsory for them to enter and exit from KSA on same dates or they can land and exit from KSA on different dates.? In fact my mother can spend more time in KSA but on the contrary my father can avail only 21 days vacations from his office.

Can anyone guide me?

They both can enter and exit at different dates as long as the visa is valid !! Do check the dates of visa validity once it's stamped on the passport. Sometimes one gets for 30 days and the other gets for 90 days !! Just a heads up.

Thank you very much indeed for your kind answer.Stay Blessed!