I have five bookcases that are 4' x 7'h. I also have 12 others of various heights (3 feet to 6 feet) and widths (mostly 3 feet or 4 feet wide). so, without measuring everything in detail, and allowing 3.5 feet average width for the other bookcases, that's 62 linear feet.
because I like places to display my dragons where they are less likely to be broken, I also have 3 cabinets that are at least half glass fronted and are 6 1/2 feet high and a total of 16 more linear feet wide. That's not counting my bedroom dressers or my China/linen cabinet or various other display unit units.
Then I can start counting how much art I have to hang. Fortunately, most of it is not very large. So I can get several pieces per wall segment.
The original Facebook post of someone else's page by someone else
I also have to run sturdy extension cords from behind the furniture because they're blocking an outlet. Fortunately in this newer house of mine, there are usually plenty of other outlets in the room.
Life is complicated when you like your Things.