Taming and Settling in.
Winter White Hamsters are dwarf hamsters and will not grow to the size of an ordinary Syrian Hamster. Hamsters are nocturnal and sleep the majority of the day and come out at night.
When you first buy a Winter White Hamster it probably needs to be tamed. Leave it/them in the cage for the first day to allow time to adjust to the new surroundings. Then start to gently stroke it/them for several minutes a few times a day until it is used to you.