Most aerated teas are brewed for 24 hours but are best used within 4 hours because the brewing increases the microbial counts to the point of saturation but as soon as the aeration is turned off they start dying.
In contrast non aerated compost tea can be 4-7 days old and since the environment is not drastically changed they don't die off as fast
As to the benefits of compost tea, the results are mixed. Compost itself has a lot of benefits but since compost is not a homogenous substance it is hard to do scientific studies on them. Every batch will be different and the microbe types and numbers will be different. It is often luck of the draw since the food source you feed them attracts both the good and bad kind of microbes. If you have good quality compost you should have good quality tea. Remember also that non aerated teas will favor different microbes than aerated teas. There has not been any definitive studies yet that prove the benefits of compost teas. However, usually people who go through the trouble to brew them are probably also not neglecting their plants, so they tend to have healthier landscapes anyway.
For myself, I prefer to try to provide a wide variety of plants to attract beneficial insects and animals to take care of the pests. Most of the plants grown in Hawaii are alien species anyway, so it is just finding the most adaptable plants and knowing when something just isn't happy and does not belong. if I have problems with a particular disease or pest on a specific plant, I relocate the plant or stop planting it for a couple of years and hope that the problem does not resurface. if it does, then I can't plant it. That is why I have a hard time planting sweet basil. Unless a basil is developed with better resistance to downy mildew, it just does not do well. I am not purely organic, I add compost, but for the most part I don't use a lot of mulch and I fertilize based on my soil test recommendations now instead of just applying fertilizer blindly. I do use vermicompost and I make compost tea occasionally, but I think it is all of the things in combination that we do that makes for a healthy landscape and not just one thing that matters.
https://puyallup.wsu.edu/wp-content/upl ... -tea-2.pdf
http://www.compostjunkie.com/how-long-b ... s-bad.html
Happy gardening in Hawaii. Gardens are where people grow.