The half-life of testosterone decanoate, a long-acting ester of testosterone, can vary depending on factors such as the individual's metabolism, the specific formulation of the compound, and the method of administration. In general, the half-life of testosterone decanoate is estimated to be approximately 7 to 12 days.
Testosterone decanoate is one of the many esterified forms of testosterone used in hormone replacement therapy (HRT) and anabolic steroid preparations. Due to its relatively long half-life, it is administered less frequently than shorter-acting testosterone esters like testosterone propionate.
Keep in mind that the actual duration of action can vary among individuals, and it's essential to follow medical advice and dosing instructions when using testosterone decanoate or any other form of testosterone replacement therapy, as misuse or abuse can have adverse health effects. Additionally, the use of testosterone and related compounds may be subject to legal regulations and restrictions in different countries.