DS-160 Validity/Expiry

I have read that the DS-160 (Non-immigrant visa application for the US) expires after 30 days. This is probably true for applications that are not yet submitted, so that they get purged from the system after that duration.
However, is the same true for submitted applications?
My worry is the following: Suppose I fill out a DS-160, submit it, and use it to schedule a consulate visa interview say 2 months out. Will the system automatically delete the DS-160 30 days after the date of scheduling, such that the consulate officer cannot retrieve the form? Or is such a worry unjustified?
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DS 160 - When to Complete?
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