Depends on the girl. Some of them are just an hour of the girl soullessly listing off names with some random bit added to the end of it, and no variation. "Thank you anon-chan. Thank you dipshit-chan", etc.
Some of the girls treat it more like a chatting stream where they discuss various things that happened, tell stories, have impromptu karaoke, shit like that. I've seen "superchat reading" sections where the chuuba legit forgot to get to the part where she reads off superchats, because she was having too much fun shooting the shit with chat.
I'd suggest watching the superchat portion at least once, to see what its like. Sometimes its worth it. Sometimes it's soulless. Sometimes it ends up being the best part of the stream. Sometimes its so boring it makes you want to commit not alive...
