Usually BOP grades are good for one good steep. Since it is not as fluffy and is more dense than OP grades, you use less leaf by volume.
SHORTER steeps, often a minute or less or the tea can get bitter. The small particles release flavors (good and bad) quickly.
I would go "Western" and use about 2 grams or so for 180 ml. And a good screen or strainer would be helpful ...
Some BOPs can be pretty decent, and most can be crappola ... good luck