Teabags: for how long should I let them sit in the hot water?
This will vary greatly depending on the type of tea you are drinking. Green and white teas can have steeping times as short as 30 seconds, and darker teas like puehr can sometimes steep 7 minutes or more. It can also depend on if you are re-steeping the tea (which, using teabags, you probably aren't), as each additional steep will require more time.