That is the rule of thumb. When people have damage to the neurological system regardless of source, it is an entire of year before any permanence is apparent. It is why rehabilitation is vitally important. Virus damage with a corona virus could be different, but, not from what I am hearing. It is about a year before people are getting their smell and taste senses back.
Nerves do repair, but, it takes longer than other body systems. There is always the chance there will not be a recovery.
Of 52 patients who completed the study (click here) (27 SARS-CoV-2+, 25 SARS-CoV-2−) a median 14.8 (range 11–18) months after symptom onset, mean age was 42.8 years, 73% were female, and 77% were vaccinated for SARS-CoV-2. Overall, there was no significant change in the frequency of most neurologic symptoms between first and follow-up evaluations, including “brain fog” (81 vs. 71%), numbness/tingling (69 vs. 65%), headache (67 vs. 54%), dizziness (50 vs. 54%), blurred vision (34 vs. 44%), tinnitus (33 vs. 42%), and fatigue (87 vs. 81%). However, dysgeusia and anosmia decreased overall (63 vs. 27%, 58 vs. 21%, both p < 0.001). Conversely, heart rate and blood pressure variation (35 vs. 56%, p = 0.01) and gastrointestinal symptoms (27 vs. 48%, p = 0.04) increased at follow-up. Patients reported improvements in their recovery, cognitive function, and fatigue, but quality of life measures remained lower than the US normative population (p < 0.001). SARS-CoV-2 vaccination did not have a positive or detrimental impact on cognitive function or fatigue.
