If an NPC has to make a speech, make it relevant and entertaining.

Or you could go the other way and make it long-winded and boring, and require the PCs to make Stamina saving throws to not fall asleep. And of course anyone who has the temerity to fall asleep during the king's speech wakes up in the dungeons.

Transcript

Han: Congratulations, Mrs Greedo.
Nien Nunb: I'd like to make a speech!
Nien Nunb: In my experience, love is a bond that stretches across the vast loneliness of space.
Nien Nunb: No matter how far, or how long it's been since they last responded, you still know they're out there. Somewhere.
Nien Nunb: If you keep them in your heart, they'll always be with you. In spirit.
Nien Nunb: Love defies all reason and logic. It's eternal, and unending, and unbreakable.
Nien Nunb: Congratulations to Han and Princess! May you always be as happy as me and Mon Mothma.
{beat}
Leia: We'll try, Nien.