Finishes are typically fast but my drywall messed up so it took me another month to refinish it for paint 2x.

So it can be refinished once or maybe twice.

My father and I install and sand and refinish real hardwood flooring.

Strengthen and refinish parking structure walls & roof.

On my flips I almost exclusively rip out carpet if it's there, and refinish the hardwood floors.  

The last building is also "new construction" and I am in the midst of completing makeover type renovations there- fully repaint, refinish HW floors, replace bath vanities, window treatments, etc., etc., Basically lots of little PITA things.  

by the time you get all the texture off and refinish and repaint the ceiling you are not saving anything. 

I renovate to create a bullet proof, durable dwelling and always include a few basic frills (tiled tub surround...refinished hardwood floors...mini blinds on the first floor)I always remove obsolete items like gravity furnaces (love used 80% efficient units and used gas water heaters...I'd drive a hundred miles to pickup a truckload at the right price) and definitely remove cast iron tubs with those silly ring shower curtains for new tubs with a shower head. 

Also, HD sells a "cabinet refinishing" kit for around $35 that I've used that works wonders on old cabinets.

So, now I've gone from a cashflowing property to a property that's costing me a mortgage payment every month and needs over $50k of work (the only way to fix the problem was to demo all of the flood damaged drywall, cabinetry, and  trim, jackhammer through the slab, excavate and remove over 5 truckloads of concrete and clay (by hand), install and plumb an industrial level sump and irrigation system, backfill it with rock (by hand), re-pour the slab, and re-finish everything.How is this relevant to your question?