Kitchen Cleaning

This post purports to set a schedule for deep-cleaning your kitchen in twenty minutes a day over thirty days. Seems like a good idea in theory, but if you add it up over the thirty days, this is ten hours of cleaning.  Surely a kitchen can be cleaned -- even deep cleaned -- in a fraction of that time?  I'd rather set aside two or three hours on a weekend to do it all than parcel out twenty minutes every day to clean one room of my home.  Also, does it really take twenty minutes to, say, clean a trash can?