From what I hear its about the same as Test E... about 4-6 weeks. Like I said though, I dont have any knowledge firsthand on that ester. But I LOVE me some Mast Prop!! By the way, the difference between 100mg EOD and 200mg EOD of prop is, like... three times as effective!! I just finished the Sustanon I had for this cycle, and am running out my last vial of mast @ 200mg EOD while the longer esters of test in the Sust clear my system before PCT. I did my 4th injection at that dose (200mg Mast P, no Sustanon) today, the strength gains are unbelieveable!! I am at the END of a 14 week cycle, and since my last pin of Sustanon last week my gains have skyrocketed - literally the DAY I did the first 200 shot I noticed it. Maybe its mental, but DAMN, no end of cycle plateau here!! Highly reccommended!!