When you judge the tea to be just right,remove the scoby, decant kombucha into bottles and refrigerate, keeping a bit of the tea back as a starter for the next round.
You will see a new baby scoby will have formed which you can then separate from the old one to make 2 batches the next time. Alternatively, spread the love and give one away.
Check your scoby for signs of mould – bubbles are fine, black patches are not.