For the whole shelf life
Updated
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The requirement
The reduction must hold "for a period at least as long as the shelf life of the product when stored under normal and moderate abuse conditions".
Which couples two decisions
The stated shelf life and the validated process. Extending the first without revisiting the second is a change to a HACCP plan rather than a marketing adjustment.
Normal and moderate abuse
Not ideal storage. A product that holds up refrigerated and fails in a warm delivery van has not met this, and the van is the realistic condition rather than the exception.
So shelf life is a claim to be earned
A longer date sells better, travels further and needs more proof. The honest route is to validate the life you can support and state that, rather than to state what the market wants.
Packaging is part of holding it
A container that admits oxygen or light over weeks changes the product within the stated life. The process reduced the pathogens; the package has to keep the result.
Which brings PET into the question
PET is the catalog's largest material and 246 of the 305 containers on this shelf. Its oxygen barrier is good rather than perfect, which for a long-dated juice is a real consideration against glass.
Test at the end of life, not the start
Hold samples under the conditions the product will actually meet and examine them at the stated date. That is what the requirement is asking you to be able to show.
And keep the samples
Retained units from every batch, held to the end of their life. When a question arrives about a batch, a retained sample is the only evidence that is not a reconstruction.