What is the "Shelf Life" for NSW and RO/DI water?

[sco999]

I have 2 20gallon brute containers. In one I keep NSW, and the other is for RO/DI water. My question is how long is the NSW good for and how long is RO/DI water good for? NSW container houses a maxijet 900 and a heater, which will run 24/7.
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[porcpuf]

I have seen posts of people that have kept theirs for a month with no problems. The RO/DI water I currently buy comes in 1 gallon containers and is labeled with an expiration date of one year (It was packaged 04-14-05 and expires on 4-14-06 for example)
Hope this helps.