I am an INTP, but just a little bit more on the I- than on the E-side. I can go out and have a very lively conversation for 3, 4 hours. People wouldn't think I'm an introvert. However 10 minutes on the phone just completely drains all energy out of me. With anyone. On any subject. I have a ENFJ-friend who can call for up to 45 minutes. Terrible, I communicated that a few times, but I guess that wouldn't stop an ENFJ.
Why does it cost so more energy to call than to talk in real life? Is it the pauses, the lack of other input than voice, is this TiNe, or what?