Do enzymes only live for 8 hours

Using enzyme based cleaning fluid I found a claim on Walker Audio which said

"That It is important to understand that the enzymes remain active for only about eight to ten hours before they die".

So does that mean the 1 gal of VPI cleaning solution I made up last year is doing sweet FA when it comes to cleaning my albums?
As I am no a chemist and no nothing about enzymes and there life span can someone elaborate?

Does a record cleaning fluid that uses enzymes only have a working window of 8 hours, or is this statement just marketing bull?