This is roughly how many times you can level up the rift by doing all archive challenges
So if we assume each regular challenge gives us 5 rift fragments and each master challenge will give us 10, and we also get 10 shards for getting to the end. knowing this we will get about 630 fragments from completing all the challenges in the archives, which is 63 levels for the rift. the amount of shards per challenge will be slightly off for some challenges but i think this number is reasonable to go off of.
I know that not all regular challenges give us 5 fragments and that in the level 4 the master challenges give us 15 fragments but since we don't know what the challenges in levels 2 and 3 give us i just gave regular and master challenges a set value of fragments you get from completing them. How did i get this number? i found a leak for how many challenges there are for levels 2 and 3. in level 2 there are 18 challenges including 9 master challenges and in level 3 there are 20 challenges including 10 master challenges. we already know that in level 1 there are 21 challenges including 10 master challenges and in level 4 there are 15 master challenges. so by doing the simple math of 44*10 + 30*5 + 40 will equal 630.
since we will get about 63 levels for fully completing the archives that means it will take another 70 fragments from playing the game to fully complete the rift. i think this is do able but only if you can actually get the challenges done.
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if anyone wants to know where i found the leak its in reddit r/leaksbydaylight