there has been an analysis of the second biggest public health insurer in Germany (Barmer) that had a statistic that said that 6-7% of all of those infected were ill (and not working) for more than 12 weeks (and the numbers for young people weren't far of, like 4-5%)[1]. Also, there has been a study in UK that 400k people suffer from long covid [2]. Caution really is the only way as long as one doesn't have the double vaccination.