I assume you're referring to this study.

https://www.thelancet.com/journals/lancet/article/PIIS0140-6...

They studied hospitalized patients, who by definition had severe symptoms. We would expect more severe symptoms to take longer to resolve. I don't know the exact numbers in China but in the US 95% of cases were never hospitalized.

https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/burd...

The study also counted anxiety and depression as "long COVID" symptoms which doesn't make much sense; they haven't proposed a biological mechanism of action for SARS-CoV-2 to directly cause such psychiatric symptoms.

I would still encourage everyone to get vaccinated if they can because the data shows it cuts the risk of death to virtually zero.