First of all, I’d suggest you read
this thread.
If the extract you use actually contained 320mg salvinorin A per gram (equivalent to a standardized 128X), then a moderately strong breakthrough dose would be about 3mg. Also, with an extract that strong, the salvinorin A wouldn’t adhere to the leaf and you’d have a loose mix of leaf and salvinorin A powder. Accurate and safe dosing would be impossible with such a product.
The first thing I’d recommend doing is getting an extract from a reputable vendor. A vendor claiming to have an extract containing 320mg salvinorin A per gram is lying, plain and simple. You don’t need 128X extract to have a deep experience!!! An extract in the 10X – 20X is more than adequate to propel anyone very far.
I’ve never heard of a salvia trip lasting only 15 seconds. The time from completion of inhalation to first effects is itself 20 seconds or so, so I wonder if what you’re consuming is even salvia. Also, in my experience at least, time dilation is not very pronounced with salvia – a ten minute journey usually feels like a ten minute journey.
Based on the fact that you had a longer-lasting breakthrough with a different extract, I would say that the extract you’re using now is bunk.
gibran2 is a fictional character. Any resemblance to anyone living or dead is purely coincidental.