With the new KMS updates

And how much does that affect their DPS?

And iirc, for demo even if it's invincible, once you get out of your attack, you can't attack right away aka spamming. There is a slight animation delay.

If the above are true, then the difference in time is negligible.

Even DS has a delay, but people say it's spammable. For buccs, spammable means "lower delay than other skills" i guess.

Anyway yeah, demo has that delay. It's only like half a second though.