If it’s cypionate, then it has a 5-7 day half-life regardless of how much is injected. It’s the type of ester that determine the half-life.
I hope you’re paying attention to hemoglobin and hematocrit.
Your testosterone levels will drop dramatically in 3 weeks, 50% within the first week, 75% by the third week.
A 3 week cycle is pointless, nothing will be gained from such a short cycle.
It appears you have no idea what you’ve got yourself into, you’re already on a cycle and are asking questions that should have been asked before starting anything.
The only advice you’ll get regarding cycles will be limited, because this isn’t a bodybuilding forum, it’s a men’s health forum where your health is priority number one.