In the U.S. simply due to the size of the country shipping by ground service can take four to five days but in Japan even with slowest delivery service usually do not take that long.

However, just like hotels in Europe or the U.S. many hotels in Japan will be happy to accept shipment for you few days prior to your arrival given that you do hold reservation at that hotel. Simply inform the hotel beforehand, just like in Europe or the U.S.