Depends on what you like eating, do you want something different every breakfast, lunch and dinner.
Do you all work in the house? Are you feeding just adults or are children mixed in as well?
Do you/any of you eat out the house regularly (school/work)?
Is only one adult responsible for food?
Do you have fussy eaters or people who complain if you make something and it wasn't what they wanted even though they never mentioned what they did?
Does the chef like cooking?
So many possible variables.
I can tell you what we do.
H & I don't eat first thing, kids are hit and miss, but when they do they love a couple of boiled eggs (runny yolk) and toast (takes 10 minutes max), or a bowl of home mixed muesli and milk (2 minutes prep) or even quicker a couple of bananas, or just even toast and marmalade. It's all quick in the week basically.
Lunch H has at work, teens have at school (packed lunch but again 10 minutes in the morning whilst boiling some eggs). I will happily have fruit (fruit salad which takes about 30 minutes to prep a large bowl but will keep for lunch and after school snack for 3 days so effectively 10 minutes a day) and a handful of nuts. Easy fine, mix of vitamins and protein, if I want a carb I will have an oatcake with houmous, or cottage cheese.
Dinner is where it takes the time, can be anything from 20 minutes to 2 hours so pointless to type it all out. This really depends on how much time you have, who you are feeding and if you like cooking.
None of this takes over my entire day or thinking time.