Tea Question

I am trying to drink tea. I did not like tea when I was young, but there are lots of things that I did not like when I was young that I like now. It must be time to give tea another show. On top of that, I am trying to cut down my night time caffeine. I love going to coffee houses, but sometimes I want to stay away from caffeine. Decaf coffee just does not do it.

I just do not know when tea is done. I am not sure how long I am supposed to keep it in the water. How do I know when my tea is done?