Over 6000 km/h. So 15 -20 minutes would be just right.
Discussion
Damn that's fast 😬
It depends on what they used. They had at some point Fatah XX (can't remember the number) which was over 6000 km/h. In the meantime, they might have newer models, secret models, etc. Plus the fact that the speed varies, at reentry they can go way faster. Plus the fact that I don't know what the launching point was.