Google group has a character count limit, after which it will add a break with a "show more" button.
I just tested a 3100 characters post and the button did not appear, but I don't know if that's because I'm the poster. As you can see I'm technologically impaired. If by any chance you have the numbers, I'd be grateful. I tried asking Google, but it wasn't my friend.
Splitting it up it is, then... thanks for the answer.