How many places I can visit with 10 hours Layover at HK airport.

Well, you can make full use of this 10-hour-layover to tour around the downtown area. And you can go many places because of the convenient transportation.
From the airport, you can take airport express to HK Station first. It only takes around 24 mins. Then walk to Central Station. There are lots of shopping malls and local restaurants for you to choose. Then you can go to Tsim Sha Tsui and Avenue of Stars. Taking subways is a good way for you to choose. Just pay attention to the time and return to the airport in time:-)