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The prep time is really about 10 minutes if you don't count the 30 minutes to drain and 30 mins to dry, when you can be doing something else.
The Kitchn notes that the cornstarch step doesn't really help if the tofu is chilled after baking. I can attest that this method works best if you eat the tofu straight from the oven. However, I didn't try chilling and then re-heating the baked cubes or rectangles that had been tossed in baking powder and then cornstarch.