Storage condition of ATCC

What is the storage condition of ATCC culture? Someone said, it should be minus (-) 80 dec C. Is there any reference please? Again. after subculture preparation from ATCC what will be storage condition of subculture ? Someone said it will be minus ( - ) 20 deg C. How many times subculture can be prepared from ATCC?

Only do 5 passage from mother culture