Is 24 character slots a lot? Check this out.

Wait a second. If it's 4 worlds merged, the thing is that you can enter from each server, and each server has its own slots. And since the maximum is 24... 24x4 is 96. I guess they just mean each character will still fit, but with the server limitations between them.

I'm 85% sure this is what they mean, I doubt they're going to allow you to buy 96 character slots. It's more of a "Don't worry, because your account CAN hold the characters, they won't be deleted"

So the only way you'll have 96 characters is if you have 24 on each server already.