I'm like Jubei. I would feel Sust kicking in within 10 days myself. I also felt the Tren kicking in by day 3. I think it really depends on where your natural levels are. If you are naturally on the low side, it doesn't take much to make you feel a quick difference. There isn't much Prop in the Sust, but I think there's enough to get you rolling if all conditions are right. Next time frontload a gram, and then go to the 500 per week, and you'll feel it a lot better.