I lost mine for I dunno a week or so starting the last day of a holiday, making getting a cab in Spain to the airport and through the airport a task, then back to school a couple days later with teachers taking attendance all wondering why I wasn't responding.
Was bizarre, up to that point I'd never lost my voice nor seen anyone lose theres, get horse, talk quietly sure, but barely even able to get out the lowest of low whispers.... was odd. First holiday on my own, not fantastic at Spanish anyway and unable to speak... very weird.