Cash Crops, a compost tea is really doing one thing ..... inoculating your soil. You are taking compost/vermicompost, and adding a food stock (blackstrap molasses) and bubbling that for apx 48 hours, which will multiply the microbes present in your compost by up to 20,000x. By pouring this in to your soil, you are adding a substantial amount of new critters to your medium which will get to work breaking down and storing whatever organic amendments you originally added to your soil. These critters will eat other microbes, and be eaten by larger predators in the soil food web which in turn will feed your plant.
I use compost teas maybe 2-3 times during a grow. I like to wet my soil down with a compost tea while it's sitting. My thinking here is that I'm giving my medium a jump-start in making my organic inputs bio-available. I will add a tea in veg, and one more early on in flower. Some people like to use them much more frequently. I don't know what the optimal amount of teas would be, but I do know that you're certainly not going to hurt anything by using AACt's frequently. Just make sure that you're supplying a sufficient amount of oxygen to your brew so that you are not dumping an anaerobic mess in to your containers.