ok. my frame shipped. paid on may 6th shipped on may 5th. ordered raw frame.
do you know how long it takes to arrive in europe?

I'm in UK and was quoted 10-18days.
You should have been given a shipping duration

The bike has now 500 km, I find it very comfortable with the 30mm tires. I left a couple of extra spacers, at least one will be removed.
The final weight is around 7.4 kg without pedals.

Next upgrade the wheels, at least 50mm 

Where did you get the decals?! If this is the same bike that was posted on bdc-mag forum that means I might be able to source them as well 

ok. my frame shipped. paid on may 6th shipped on may 5th. ordered raw frame.
do you know how long it takes to arrive in europe?

I asked the Magene cutomer support and the answer was:

"Dear Customer,
Good day. Thanks for your support on Magene.

Regarding your inquiry, we need to clarify that our P515 is compatible with T47 BBs, including both the 68 and 86 versions.

Thanks for your cooperation in advance.
Best regards,
Alecia"

On AliEx (Magene shop) you can read:
Not Support T47-86.5mm and BB386 bottom bracket ！

So at least half of the CS answer is wrong.
I wonder about the other half.

Yoho, the famous jailed Peter, Nicole's bike store, .. they all use the same mold if you ask me.
There is a bigger player behind the frame. Tantan is just a reseller that chooses not to put fake branding on the frame.
But where these are being made is a mystery.

I agree and everyone wants to know who is making it!  — Tan Tan can openly sell the frames, but there are subtle differences that seem designed to skirt around IP infringement.

One example: seat posts don’t interchange between the X68 and the SL8. The X68 is about 1mm wider, so while it looks nearly identical the difference are so subtle you just don't notice them and from what i can see this is the only differences this is Just enough of a difference to avoid a direct copy, I think.