So how many cups is 50g of tea? Or 1lb of tea leaves?
The appropriate amount to use depends on the size of the teapot, teacup, or gaiwan, and how much water is being applied. Typically, an average serving of tea in a small-medium vessel is about 4-6 grams. Experienced tea drinkers will often use 6-8 grams per serving - with shorter and more frequent infusions.
Therefore, a 50 gram pouch of tea should be good for 8-12 servings of tea. Depending on the type of tea, however, the leaves can withstand several "steepings", so that 50 gram pouch should allow for 24-50 cups of tea! And, since a pound (lb) is about 450 grams, a properly steeped pound of tea should produce several hundred cups of tea!
Quantity of Tea
Cups of Tea*
*often depending on the technique of the tea master, time per infusion, and thirst of the drinkers