We had brown rice and broccoli for dinner last night. Time to cook the rice was about 45 minutes, the broccoli about 5. Time involved was maybe five minutes: measure rice and water, bring to boil, put on the lid. Later on, peek at it for progress. For the broccoli, wash, cut up and put into the pot, bring to boil, prod with fork.

Of course there is a time cost in shopping, but the broccoli and rice made up a small part of the shopping runs that included them.