Well it's not really a Norwood level since it's diffused all the way, including the sides and back, it's called DUPA. It has really progressed over the years, so I guess it's sort of an equivalent to NW4 maybe, I am not sure, so yeah, it's bad.
I took a shower this morning and the substance is still a bit in the scalp, I don't know if it went inside or it was just residual, because it was very yellow, but most of it washed off. I guess not all will go inside, just like everything.
Doing the calculations it seems I will have enough for 2 months, then I have to get more stuff.