How long does it take to ride 9 miles?

Answer 1

Depends on a lot of things, how fit you are, how hard you're trying, where you're riding, what bike you're using and so on.

On easily ridden roads, a pack of racers could do it in about 15 minutes. Riding solo, I'd need about the double. Some may need more.

Answer 2

There's no set answer to that question, as it would depend on how fast you're going. And that would depend on quite a lot of things, how fit you are, how hard you're trying, what kind of bike you're riding, uphill/downhill, headwind/tailwind, if you're carrying any gear, if it's a short race or a part of a longer ride, road/offroad....

Under most circumstances it'd probably take about one hour, although a real pro under ideal conditions could pull it off in considerably less on level ground.