For me not a lot.
I find talking difficult. I don't know what to say, how to make my face react along with speech. I find it overwhelming and exhausting. I also suffer from CFS as well as autism and even a short conversation requires me to have a 20 min nap so I reclaim some much needed energy.
When I was little I didn't talk much then. I find that I need to judge whether it's worth me speaking, which sometimes I feel makes me come across a little rudely when I'm not I'm just trying to do what's best for me.
Sometimes I talk to myself, not in a crazy way mind, just where I say what I'm thinking which helps me think and work things out.
Generally I stay silent though. Talking is tiring and it's stressful. I feel happier when I'm saying nothing.