I boiled up a session with this tea for my daughter and her boyfriend this last weekend, 5g tea, 500ml water, boiling in a small pot. I try to keep the boil low so that too much water does not boil away.
This session I boiled the leaf for 10 minutes (the soup was not red enough for me after 5) and poured off 250ml which I replaced with fresh water and reboiled. I repeated this several times, increasing the boiling time like 15, 20, 25 min. Even after the 4th boiling this tea was still making fairly dark soup but we had to knock it off by that point and I was not ashamed to discard the leaves.
Flavors: Smooth, Spices, Wood