I stopped brewing tea the morning after when I came in to work on Monday and found some "home-made penacillin" in the bottom of my mug (fr Friday)!
I usually start early at work and dump the leaves when I leave. Maybe 1-2 hr is the longest between brewing . . . When brewing at home "J" and I share, but if I do start late I dump whatever I started the night before.
This discussion has come up b/4 and there are a few who will rinse with brew temp water and start in the morning where they left off the night before.