That is not good. I am hoping his symptoms are very mild. I know a few people who have had Covid and even though they stopped testing positive they still didn't feel great for months afterwards.
Had that happen to me with the flu in 2016
got sick the Tuesday before Thanksgiving, the fever and cough were gone in about 5 days, but the tired, achy, feel like total dog poop stuff went on until mid February
the doctor told me I had Postviral Fatigue Syndrome, and it would go away when it went away
it absolutely sucks, I was completely miserable and then one morning I woke up and it was like a switch had flipped and it was gone
wouldn't wish it on anyone (well, maybe Joe Thornton)