It lasts far longer than any other medium (media?). A point was made that if the laws of the land were only stored on digital media then it would be possible for nefarious people to alter them.
hc4361 - we went to see the magna carta at Saliburry cathdral and the exhibition with it shows how they were able to correct errors on the vellum, so perhaps nothing is safe.
Scrape it with a pen-knife and then re-write it is the method.
yup and if you scrape the whole lot and re use it as newspaper or something then it is called a palimpsest
Paper is relatively late and the time it lasts will of course depend on storage conditions
There was very little in Egypt before 1000 AD - and it survives in good condition in the dry desert
so 5000 y is a long shot
I think people are thinking about the Victorian paper production which involved acid and that accounts why some victorian publications are falling apart and some eighteenth century books are still in good condition
True vellum or parchment is made from animal skin, rather like leather. In museums there are plenty of pieces of parchment which have lasted over a thousand years. If not deliberately damaged or exposed to damp or decay or pests, like mice, parchment is almost eternal. Book of Kells, Lindisfarne Gospels, etc etc
Vellum is derived from the Latin word "vitulinum" meaning "made from calf", leading to Old French "vélin" ("calfskin").[1] The term often refers to a parchment made from calf skin, as opposed to that from other animals.[2]
hell these researchers never stick to their word ....