How long does the putrid serum stay in the rift?

So i thought about this, i already achieved every challenge of tome 1 and started at rift tier 5. I am currently on rift tier 17. To reach rift tier 47, which is the last tier with putrid serum, i literally need to get 300 rift pieces just from playing the game. And because you can't get 800 exp in a normal match, i have to play more than 300 games to fully complete the event. Is it only me or is it literally impossible to achieve this as somebody playing this game not full time?

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