Ours has been in a perennial state of remodel ever since we got it.
I will say though at the moment it’s not that messed up, most of it is put together just little touches are undone, like trimwork around floor and things like that. Nothing majorly affecting function is missing at moment.
Bought house in 1997, and have done kitchen floor, cabinets, countertop, all kitchen appliances (all 3 projects done at different times and by myself). Most of those though didnt affect function much beyond a day or two each though, and just trimwork crap has never been fnished fully yet cause I hate cutting weird angles into baseboard and so on.
Also redid main bathroom and master bathrooms, both of those were single day projects.
Cut a french door hole into a wall between living room and dining area, that was a mess for a few years. Finally completed the sheetrock/trimwork and installed french doors after about 2 years of just a hole with messy sheetrock edges and studs exposed.
Added some drains into basement floor near the furnace/water heater. Originally our house had a full unifnished basement so they had those plastic tubes running 15 feet from furnace drain to floor drain, well after basement was mostly finished (done before we moved in) those tubes kinda became a big hassle, so i busted up floor and cut into main drain pipe of house and added in another connection so I coudl put a drain with a trap in floor. Still havent re concreted the floor yet, just a hole with sand and pipes. Been about a year like that, reason is because I want to install a bathroom down there and thus need access to pipes and will have to bust up more floor to do so. Yeah fun.
Aside from that havent done any major work on my house, I did add a fully separate 3 car garage into backyard by myself. Took about 3 weeks to build that plus another week for concrete to dry (before building of course).
Now my parents house, that is another story. We added on a 20x20 addition, changed rooms around, bathrooms, hallway, along with all carpet, flooring, electrical, windows… Still not fully done, been about 4 years in the making. Damn it’s a right pain putting in new plumbing air pipes into existing houses, gotta run all the way from basement up through roof and go through inside of wallspace.
Also totally changed their kitchen, new cabinets, floor, counters, different design and shapes. Had to move plumbing and electrical, tore floor out down to joists. One of those jobs that would be a nightmare with little kids around cause it was days and days with no kitchen access and even longer without function.