Yet another stupid question...

I've been reading up on half-lifes of some roids and, for example, I will most likely be doing a test cypionate cycle soon, since it's half life is of 12 days why not dose the injections like this
day 1---400 mg (assuming this is what you want)
day 13--200 mg (because 200 mg of the original is still there)
day 25--200 mg ...
and so on therefore keeping levels constant instead of injecting every week and then accumulating the amount of artificial testosterone in your body.

That is active half life, true half liife is closer to 5-6 days. There are blood level calculators out there if you want to get freaky, but I can't vouch for their accuracy and most likely there is no reason for you to over complicate things.