Amdahl's law applies, what fraction of cooking these recipes is purely serial? What does the critical path look like? How much inter-kitchen communication is there to get tools and ingredients to/from your wife?
What bothers me a lot down in this whole thread, is that many people seem to forget that spending time feeding oneself is actually spending time taking care of oneself (and one's family if any). And that seems to me a very important part of life.
The prep is usually highly parallelize; the cooking is usually pretty serial if you follow the instructions, but often parallelize with only mild invention (they often specify reusing the same pan, without any real need other than reducing cleanup and equipment requirements.)