I have learned something crucial about this tea today. It can handle a magnificent oversteep relatively well.
My colleague made tea for me, but when she does, she just pours the water on and expects me to remove the filter bag myself after an appropriate steeping time. This is very easy when she makes it without telling me until half an hour later when she comments on the fact that I hadn’t taken any yet. Well no, I didn’t have time yet. And it took some two hours more before I had.
As is my habit, I always taste it before tossing it away, and while it is definitely strong and definitely astringent, it’s not bitter and it’s not at all undrinkable. It’s far from optimal, but it’s tolerable. It gained a coffeeish side-flavour which I’m not all that fond of, but it wasn’t completely ruined.
That’s good to know in other similar emergencies.