Hard to say exactly. I definitely had effects that lingered beyond the ten days of "sickness." Several months of having a hard time concentrating. That's gone now. I was also incredibly tired. I'd take one or two naps at day at work, just putting my head down on the desk, and sleep for 20 mins. My partner was very cool about it, and the employees were all working from home so they never knew.
Now I make it through the day, but take a nap right when I get home, if I don't have to drop off and pick up our daughter.
One thing, and I don't know if it is related to covid or not, I have headaches a lot. Some are just low level some are really bad. I never used to get headaches much and if I did, a glass or water, cup of coffee or a single aspirin would knock it out. This headache seems to be immune to any treatment.
Sometimes I wonder, maybe I have covid again? If you've been vaxxed and get a breakthrough, maybe this is what it is?