Every one of the additional bounties that you can buy from each of the vendors awards bright dust. You can take 5 per vendor at a time, and can replenish those as soon as they are completed. (One at a time even, don’t have to do all five first). Pretty much every vendor has them, so you can play whatever makes you happy and have an unlimited amount of bright dust earning potential. (Does suck to have to run back to the tower to replenish them though.)
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I have heard tales of doing that you can earn 200-250 bright dust an hour. And if you play 4 hours a day, 7 days a week thats 5600-7000 bright dust from those bounties plus the ones for 200 each you can knock out at the same time. And if you do it across all three characters that’s like 9200-10600 bright dust a week! Do I use that method, nope. But I do get easily 3000 a week on one character sorta doing it when I remember.