If its really sust (ugs have been known to put prop and either cyp/ent and call it sust) then the Decanoate has a half life of 15 days.
Day 1: 400
Day 15: 200
Day 30: 100
Day 45: 50
Day 60: 25
Day 75: 12.5
Day 90: 6.75
Day 105: 3.375
Day 120: 1.6875
Day 135: .84375
Day 150: .421875
Day 165: .2109375
Day 180: .1055
yes those numbers get very small but I am a believer that the body can't heal until all of the hormone is gone. Sust is just a bad choice if your going to come off.