The Lifespan of an LP?

A long long time.
I stole my dad's collection when I moved out in 1975.  I remember he playing them on a Magnavox phono console in the late 50's.  I played them till 2010ish.  Those records saw a bunch of systems  Always sounded good.  Even when played before or after newer pressings.   

Chakster is right and practical for life. Unless you listen to the same for ever, they easily outlast us as I have vinyl from others lives that are still mint even though played dozens of times. 

I heard it is not a good idea to play a record more often than once a day. They say it needs time to 'recover', whatever it is.

Inna, that’s what people thought in the ’60s. playing Sergeant Pepper’s or Surrealistic Pillow over and over again was certain to wear it out in no time. When I first started getting into vinyl again in the last decade I researched the question because I wondered if it was actually true. I never found anyone currently professing to say that that is the case although it was widely believed at one point in time.

The older the vinyl the better so it’s not surprising that stuff from the late 40s the 50s and the 60s hold up so well. I’m really not so sure about the endurance of the flimsier vinyl starting approximately in the ’80s. It’s obviously a less hard and durable material. Much more prone to surface noise.

I can tell you that one of the best things to look for are mono recordings from the late 50s and early ’60s. Many of these were played very little because once stereo came out people just put them away and never played them again thinking that it was an inferior format. Over time I have found incredibly pristine mono recordings from this time period and they really are something special to experience.

Hmm, so it remains a kind of hypothesis.
I listen to some records often enough but not every day or every other day. I also clean them after 10-15 plays. For background music I listen to Nakamichi tape deck.