Long Live the Queen and her 50+ bombs trying to Blow up in your face! XD
It's about a 20kish Guildhest in total ( I am up to level 36 currently and most guildhests are indeed pointless however fun to do.)
To be honest, I don't think the bombs have an end point, if you were to keep the Queen alive it's possible you could get neverending exp.
Edit: Title typo "except" XD
Exp just moments ago went from 6170 to 27910