I want to spend New Years in the Ice and Snow Festival but I don't know how long I should stay in Harbin.

Since you are afraid of cold weather, it is suggested to spend two whole days there. On the first day, have a joy at the festival site: Sun Island, Zhaolin Park and Snow World. On the second day, visit the ice/snow statues at Central Street and roam around the city.

It is easy to take a taxi or use local bus to transport from the site to your hotel in the city. Don't worry!