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I just calculated and considering you read a total of 200 mangas in the span of 3 years, which would be approximately 66 mangas per year, you would end up reading 5,000 manga in the approximate span of 72 years in the consistency you're currently going at, making the total 75 full years to read 5,000 manga, good luck!
if I calculated wrong sybau and let me look smart

I will obtain this horrible goal I just decided to set, and I will spam read.