I’m going to take a stab at it, but there are a lot of smart people here so I won’t take offense to any criticism. If anyone feels my logic is way off, jump in and correct it.
Let’s take Testosterone Enanthate as an example because it has a 10 day half life (making the math easier) and we’ll start with 100mgs per week, again, to make the math easier to follow.
Enanthate is 71% relative steroid strength compared to suspension, which is 100%.
The assumption we’ll make is that the esters will be absorbed evenly consistent with the stated half-life and so on (even though I personally do not believe it works that way).
If you inject 100mgs of Test E on Monday, you’re really injecting 71 mgs.
Half of 70 is 35. So at the half life of day 10, you will have absorbed 35mgs, or approximately 3.5 mgs per day. Keep in mind that the next half life is at day 15, not 20. So as the esters cleave away, you start to lose your test more rapidly. At day 15 you will have used half of 35, or 17, or 3.4mgs per day, and so on.
Multiply this over the amount you inject, so if you inject 500mgs, you will have a daily absorption of 17.5mgs per day. (3.5 x 5 = 17.5).
This does not take into account injecting another load at day 4, so if you’re injecting 500mgs a week, 250 twice a week, the overlap will increase your daily absorption of test. So 500 a week, you’ll have a relatively steady absorption of maybe 35mgs per day, almost 10x’s your body’s normal production.