Yep, thou on the Adonal page there are 2 different .pdf's the second one, being very brief its saids shelf life: at least 6 months..
Now, on the APH09 page its saids "Shelf life of concentrate: up to 50 years"

In the age of the present day films, it might be not that much critical if the pH is 11.8 or 14. even thou that is more than 20 times more alkaline, thou as Ian said, temperature differences might shuffle the buffalo..