Estimation
Utilizing the half life of decanoate ester, which has been studied in depth for anti-psychotic depot preparations, it is possible to estimate the half life from the undeclynate ester. Studies have shown the plasma half life, which is different from the elimination half life (would be compound specific) to be in the range of 6-9 days. The straight chain esterase formula would estimate the decanoate ester to have a half life of 7 days and the undeclynate ester to have an 8 day half life. I think the best guess would be estimated about 8-9 days for major muscular injections (glutes, VG, Vastus Lateralis), while closer to 10 or 11 days for smaller muscle injections (delts, biceps, triceps).