How long do you cook vegetable in the oven?

I need more information to answer your question accurately! Please tell me:

* What vegetables are you cooking? Different vegetables have different cooking times.

* What is your desired outcome? Do you want them roasted, steamed, or something else?

* What temperature are you cooking at?

* What size are the vegetables cut into?

Once you provide these details, I can give you a more specific answer.