"Slay as many enemies as you can within the time limit"
No.
NO.
I'm not doing leves because I plan to spend the entire allotted time on the leve. I'm doing leves to finish them as quickly as possible so I can be done doing leves and done with leveling.
I want an option to end this leve as soon as I kill the required 3 mobs. I don't want to sit around for 5mins, and I don't want to spend 5mins killing things for the sake of killing things. I can't even accept/abandon to get the stupid thing off of the levequest list; so ignoring it isn't much of an option.
SE, these leves are dumb. They're dumber than the escort leves, which are also dumb.