Ok, I can imagine that sort of thing has already happened. Pople do make absurdly long videos, so you could be looking at a month long editing taks. However, most people probably don’t isolate themselves from the rest of the world to that extent, but it is possible. Let’s say you have an autistic youtuber who can easily get lost in editing. They just focus on editing 16 hours a day, 7 days a week, talk to nobody, put the phone on flight mode etc. Yeah, I can imagine that. Besides, nowadays you also have self checkout machines at supermarkets, so you can also skip the eye contact thing entirely when restocking the pantry.

Under extreme circumstances like that, you should gradually forget what your own voice sounds like. Would it take, weeks, months or years? Who knows.