These aren't narcotics. You don't "feel" a kick in. It is a subtle and prolonged alteration in your physique and for some mentality that indicates the hormones are at work. This is your first cycle so you have nothing to guage. You may go into the gym and be able to handle dumbells that are five pounds heavier, or do an extra rep or two, or hop on the scale and see that you're a pound or two heavier, but there is no euphoric high that "kicks in" with sust...or any long estered AS. Concentrate on your diet and training as that's where your gains in muscle mass come from and don't expect and wait for the gear to suddenly metamorphisise you.