Actually Bluebell there are two kinds of compost tea which confuses this question. Is yours the liquid seepage of compost? if so a collection of some nutrients, mainly. It would keep for a long time except for a loss of lively elements.
Compost tea as mostly made nowadays is a stirred brew, aerated for 24 hours, starting with a small amount of high quality compost, some sugars too, to multiply all the fungi and bacteria. I understand that it stays full of life for less than a day and wants uaing asap after being made. Have not used it myself, it is popular for example on golf greens where they don’t want to spread compost!
