GGB Longer than the licence timelines suggest, because the critical path is the fit-out built to comply with municipal, Civil Defence and food-safety requirements — not the paperwork. The only published processing time quoted on this page is MISA's maximum of ten days for examining an investment registration; every other stage depends on your site, your structure and how early the design was built around the requirements.
From Saudi Arabia Restaurant Licence Cost: Every Fee, Explained — the full reading, with the method behind this answer.