I got about 10,000 dust.
Plus the 3,600 dust of next week's Vanguard, Crucible and Gambit weekly bounties, it will be 13,600 dust.
Plus the, I can only assume it will be 1,200 dust from the Festival weekly bounties, it will be 14,800 bright dust for week 1 of the event.
I could have more, but apart from this week I couldn't get myself to play strikes and Gambit.
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Holy cow! Good for you! That's a lot. Haha I have 5,000 saved up--the most I've had since Shadowkeep. If you want to help pick and choose how you spend it (there's some awesome stuff coming out), check out this third party website: https://www.todayindestiny.com/eververseWeekly . It has a list of everything being offered every week, including when things are offered for silver/bright dust (if they also get offered for BD). Hope this helps. Have fun out there!