Not quite sure what you are referring to Guido?
If its the pinning twice a week to create more stable blood plasma concentrations, I personally prefer to pin twice a week with Test-E, I have found I don't respond well @ once a week, my hormones tend to bounce about too much, but that's just a personal thing, I have mates that pin once every 7-8 days it works fine for them...
Regards Test-E hitting the bloodstream with a peak at about 2 days, there are quite a few studys out there to show this, I'll try & find what I've got.... We looked into the esterification process a while back and from how I understand it:
The esters attached to the testosterone molecule are all made of the same basic elements, Carbon Hydrogen and Oxygen. Just about the only difference is the length of the ester in terms of the number of carbon atoms it contains. The carbon atoms form the 'backbone' of the ester with little hydrogen atoms poking off it, A basic Hydrocarbon structure. The carboxylic acid is added to the alcohol group on the testosterone molecule to form a bond. This bond between the testosterone molecule and the acid is called an ester bond so technically when we refer to the "ester" we are referring to the carboxylic acid part of the molecule.
There are two types of enzymes which can cleave this bond, esterases and hydrolases(sp?) they can remove any type of ester whether it be prop, enanth or cyp. This is because the enzymes target the 'ester bond' so regardless of how long the carboxylic acid group is or its composition the bond is the same for each ester of testosterone. The length of the ester doesn't determine the speed at which the ester is cleaved off the testosterone molecule but influences its solubility, so longer esters mean that it takes longer for the molecule to get absorbed into the blood stream where it can be exposed to the enzymes which remove the ester. With Enanthate we found this to be about two days, with Propionate 14-16 hours.... Decanoate about three days...