sust has a long half life due to the decanoate ester. it'll take about 3 wks after your last injection for your levels to get low enough to start PCT. you can use nolvadex or clomid for pct. for nolvadex, i would use 40mg for wk one, the 2 wks of 20mg. if clomid, 100mg wk one, the 50mg for 2 wks. i prefer nolvadex. less side effects