Hi semolinaflour,
Traceability standards vary, best practice would be 4 hours, but you need to consider the relevant standard.
Are you looking for a specific NSF product or type of certification?
The range offered by NSF is on these webpages:
https://www.nsf.org/...e=certification
https://www.nsf.org/...e=certification
Other than that they offer certification to your preferred Global Food Safety Initiative (GFSI) benchmarked scheme.
Kind regards,
Tony
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