I've had flu, or something with symptoms like it, twice as an adult, and both times it took a whole month to get through the "really feeling awful and stuck in

I've had flu, or something with symptoms like it, twice as an adult, and both times it took a whole month to get through the "really feeling awful and stuck in bed" stage. Recovery was quick afterwards. But just being ill was much more than a 1-5 day event.