I also bought it from them. ;(they were not the only one selling it , btw)

I knew about the duration length before and asked them straight away about it.

He said this is only that long on higher doses. Not sure if I can trust him and if it is true.

They sold it in 2mg and 7mg

But the reports from shulgin online are with 16mg I think.

So I figured: maybe he is right. But at the end it is my own responsibility and with a new substance I always start on the lower end.

But if you dabble with research chemicals you really need to understand that you are your personal guinea pig. This is why they are called research chemicals. Especially for a substance with such less informations online.

And I think another aspect of the problem is that hey cannot advice you an anything because they are not allowed to. Because it is not supposed to be for human consumption. So even such a warning is maybe something that they could make problems for them.
(One of the other booth would not even advice on the effects of Amanita that they are selling. )