This suggestion mainly applies to game modes with lockouts between vote books.
I think it would be useful for the addition of a chat command that would show the remaining time until your next book is ready.
Currently, you can see this dialogue by clicking to use a votebook while still on cooldown.
Another suggestion by Kharyrll was to add the cooldown timer to the game panel, maybe while the bonus xp timer is inactive it could show cooldown timer remaining for the next book?