I regularly go about 2 ½ days without making a single audible sound with my voice. Friday through Monday.
I used to talk to myself a bit or sing/hum along while listening to music but I kinda stopped doing that.
The funny thing is, I’ve recently realizied that the last and first thing I say throughout the weekend are usually the same. I say “Goodbye” to my coworkers on a Friday evening, and then I say “Goodbye” to the cashier near the self checkout at the grocery store where I grab my lunch for the day on a Monday morning. It’s sort of ironic that the first thing I say after a long period of time, is something that usually ends a conversation.
The longest would probably be something like three months. During CoVID I got tasked with keeping the IT infrastructure running in one of our satellite buildings. I was the only person in my shop assigned to this building and one of two total people in the building on any given day. The other being the janitor who did his rounds at night and then locked up the building.
I also live alone and tend to use the self-checkout at the grocery store. The only person I would have even had any real opportunity to speak to would have been the attendant at the self-checkout and they would have at most gotten the customary head-nod of greeting.
It was the second happiest time of my life, second only to the three weeks immediately following that where I did all the same stuff, but from home.