Au pairs should be given at least one day off per week to do something on their own. Once a month, this day should be a Sunday. Official public holidays in the corresponding host countries count as bank holidays for the au pairs as well and they are not required to work on these days.
Since there are no official regulations concerning holiday time granted to au pairs in Japan, AuPairWorld recommends that au pairs who wish to stay with their host families for 12 months should get four weeks off during this time with payment of the agreed pocket money. If au pairs stay for a shorter period of time, they need to agree with their host families on a correspondingly shorter period of holiday.
More information on the topic: