But we need at least 100.
no we need 200 chocolates ...
10 chocolate = 1 recipes
We need 20 recipes for 1 [Rune] Chocorunerk’s Exquisite Gift Pack
So need doing 200 instances in 3 weeks with 20 CD week so missed 140 chocolates
will the missing quest give use 140 chocolates in 2 weeks ?
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You have wrong calc to 
1 Chocolate = 10 Sinister Chocolate (10 instances)
10 Chocolate = 100 Sinister Chocolate (100 Instances)
10 Chocolate = 1 Recipe (100 Instances)
20 recipes= 200 Chocolate ->2000 Sinister Chocolate
20 Recipes = 2000 Sinister Chocolate(2000 Instances)
We miss 1940 Sinister Chocolate = 1940 Instances
maybe on 10years we will do it
PS: Relax 1000% they make mistake with the numbers because and on RU server and on Korean was need 20 instance for 10 Recipes for 1 Big Box so probably they will fix it on next maintenance