the active half-life is 36 hours.
I've heard others say this too, but it doesn't make sense to me.
For example, the active half-life of Trenbolone if it has no ester attached is going to be very short, when you attach an ester this alters the compounds total molecular weight and extends the release thereby extending the active half-life...otherwise, there's largely no point in adding an ester.
If the active half-life of Tren-a is only 36hrs as opposed to 72hrs, that would mean you have 36hrs of no hormone and only ester...that makes no sense.