From Hirafu to Rusutsu it is about 30 kilometers. Driving time is about 45-60 minutes. There are no toll fees.From Niseko Village resort, driving time is about ten minutes shorter. From central Niseko Town (as opposed to Hirafu), it is about 15 minutes shorter.
Alternatively to driving, there is a bus that takes one hour and costs around 1000 yen one way between the various resorts of Niseko and Rusutsu.