Seiko Nanouniverse SSEH01

I was wondering if anyone had any experience ordering from Sakura watches. I put in a presale request for Seiko Nanouniverse SSEH01. It’s been over a week and I haven’t even received a confirmation email that they got my request. I’m wondering if anyone knows how long it takes for them to email you after you make the presale request? Or how long this process takes in general?