Half an hour, she could probably wait that long. Hermione decided she should probably force herself to sit at the kitchen table for that duration though, just in case. "If it's anywhere close to edible, I don't think he'll believe me," she said with a smile, when Fleur mentioned telling Ron she made dinner without any help. "Thank you again though."
Nodding, Hermione gave her a little wave as she stood at the door. "I will. You do the same, and for Bill." Turning back to the oven, she resigned herself to staring at it for the next thirty minutes.