Why is it "duur" and not "duure"?
Adjectives in front of a noun usually get the additional -e (e.g. dure), except when the adjective is in front of a het woord preceded by the indefinite article een (or one of a few other words like elk) or no article. It's explained here.
Why can' t I use orde?
'Orde' is neither a Dutch nor English verb (conjugation)..