Wow, i got downvoted for complaining about my cooking times on HackerNews, this is a real innovation:

so: - 5 min walk to supermarket - 10 min in there - 5 min walk back home - washing & cutting wedgetables 7 - 10 min - maybe cutting some meat: 5 min on top - eating 5 - 10 min - cleaning up the kitchen 5 min