If you're making a large quantity of spiced iced tea, you can always cheat by adding a large can of frozen lemonade concentrate in lieu of lemon and sugar. Just be sure to add it after the tea has already cooled, otherwise it'll end up cloudy,
Yes, we know we shouldn't encourage this, but Medb's magical tea keeps forever: we never bothered to remove the tea bags until it was time to clean the urn and start a new batch, and none of us felt the tea tasted overly bitter or astringent. Or was that because the tea went so quickly that it never got a chance to get too tannic?