How far & how long does it take from xian airport to the Grand Noble hotel in a group coach?

The distance between the airport and the hotel is about 24 miles.
Do you mean airport shuttle by group coach? If so, you can take shuttle bus line 3 to the railway station first. The ticket fare is CNY 26 per person. And the travel tine is about an hour.
Then take a taxi to your hotel directly. The cab fare is CNY 10 to 15. It just takes 5 to 10 minutes.