I will be making my first business trip to Saudi Arabia later this month, flying into Riyadh on an Emirates flight from Dubai on a Saturday evening after an earlier 15 hour flight from the US west coast I have heard horror stories of the chaotic arrivals procedure - minimal signs, long lines, unhelpful staff etc. Do I line up at the Business checkpoint or the first time visitors one? I hear that the first time one could mean a wait of several hours. Any advice from seasoned travelers?