Internally Quiet For a Day

I wonder, if you were completely alone for a day, could you suppress all verbal thoughts? Just how dependent on them are you, and how hard is it to shut them down? Would you just be drifting, or could you make decisions and carry out everyday tasks?

I'm really not sure what I'd expect. I'm trying to think whether I've ever been 'internally quiet' for extended periods of time, but I can't recall how long I've ever gone like that.

And could you spend a day interacting with other people, doing tasks and verbalising on the outside, but not on the inside?