1 year of Covid.
And reinfection still remains a rare event. All the articles that I have found talk about theoretical antibody level. Not real cases jumping up and filling up hospitals.
And if the later had been the case, we would have known it from mainstream media with big headlines plus WHO would have declared the warning loudly.
Re-infection or no-reinfection will decide whether herd immunity works or not. If you are infected once and recover, are you safe or are you more vulnerable afterwards? Big difference.