been to japan 4+ times, but never used the luggage delivery service

is there an extra cost if i want to delay delivery (up to the max of 7 days)?

eg for Yamato, i see the rate chart (eg tokyo -> osaka), and if i want to pay for the time service (deliver within a speific window), but dont see a rate if i want to delay it by 3-4 days

https://www.kuronekoyamato.co.jp/ytc.../all_list.html