I'm not sure you could quantify this. I am certainly no expert, however, I haven't had the flu because I get a shot every year because I am at high risk because of Diabetes. Why didn't you have a shot because it's obvious you are at high risk as well? Given that I would say that it could take a long time
to fully recover from the flu. Maybe even 3 months or more would be my guess. I have had pneumonia
in the past and that took a long, long time
befor I full recovered.