The shortest driving time is 8 hours and 48 minutes.
On Avg it will take 10 - 11 hours with 2 stop overs.
Its around 1400 KM from Dammam/khobar to Abha. From Riyadh it's about 1000 KM. you need to take the exit for "Al-Kharaj" city from Riyadh, then it's straight Forward ( passing through two cities, "wadi ad dawasir" and khamis mushaiyt) until you reach abha finally.
with traffic and check points,1.5-2 hrs.,no hastles just 30 mins.
1 and Half hour
20 Min drive
14 hours at 70 mph.
The flight time for flights between the above places is 1 hours 6 mins This is an approximate travel time (calculated in ideal conditions. The travel speed is 500 mph and 30 mins for take off and landing). The actual time might change depending on the flight path chosen, weather conditions, etc
The distance is 4 100 km from Bucharest to Riyadh; but as you can traverse Syria and Iraq ?
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It depends on your means of travel. It would take a long time to walk and a very long time to roll.