I saw this on the tube a short while ago. It was pretty interesting.
This, from the transcript is pretty wild:
TERENCE SMITH: And how long will these last?
HENRY WILHELM: Based on accelerated aging data, depending on the original condition, we're basically talking about thousands of years; not hundreds, thousands.
TERENCE SMITH: Wow.
And next November, the temperature in this in this 10,000-square-foot cavern -- Wilhelm likens it to an ice cave -- will be dropped to minus- four degrees Fahrenheit, bringing time to a standstill. For now, the collection is being stabilized at 45 degrees, temperate enough to allow a walk through time.