well usually when the parts leave japan they dont take much more than 3 - 4 working days to turn up
my greddy plenum took a little longer cause no one was home the first time they came to deliver it so i had to wait an extra day
but the tracking number on it didnt work at all, the ones previously tho, all have, i think sometimes its just a glitch or something, i havent had to order any parts since through nengun,
be interesting to see if it works next time i order