That work by Nieschlag doesn't exclude a much earlier peak. In addition, I believe that was using 50 mg, a relatively large dose. There are reasons to believe that the apparent half-life of an ester is dose dependent, being shorter with lower doses. I've mentioned that my measurements with doses <10 mg have been consistent with peaking in under five hours—but the isolated samples are not definitive.
Regarding half-lives keep in mind that a majority of studies on the PK/PD of the various T-esters were done using IM (once weekly/fortnightly) injections in a small number of subjects and most of the literature is from decades ago.
There are many other factors that affect the rate at which the testosterone is released from the oily depot at the injection site.
Sub-q vs IM, the volume of injection, injection depth, site of injection, lymphatic flow, the concentration of BOH (benzyl alcohol) are other possible factors that can affect absorption rates of the esterified hormone.
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