Image below shows Traditional Steep Temperature, Time, and Quantity for brewing tea. Use this for tea, kombucha, and tinctures.
Going past the time mark will extract more tannins and will lead to a more bitter tea. Some people enjoy this. For a rounder, more floral flavor, do a room temperature steep for about 4-8 hours then strain before drinking. This type of infusion is referred to as Grandpa Style tea. Do NOT do over 18 hours of room temp infusion because mold spores will start to colonize. If you desire an extra long cold steep, do so in the refrigerator.
Matthew Cress, Dietitian Nutritionist
More resources:
Get my FREE Fermentation Logbook (LINK)
The PAID version of my Fermentation Logbook greatly details kahm yeast & mold prevention for fermented foods. You can find it in my shop, or at this link here.
Kombucha Tea Steeping Youtube video: https://youtu.be/yeVInsEyth8
Kombucha STUDY: A Review on Kombucha Tea—Microbiology, Composition, Fermentation, Beneficial Effects, Toxicity, and Tea Fungus (For black & green tea infusion times for kombucha)