They may provide general storage-quality guidance under specified conditions, not a replacement for each product's label or a record of when you froze it.
What the observation tells you
A symbol cannot establish the history of an unlabelled portion or make thawed food safe again. The manufacturer's chart may also apply to particular food categories and steady storage conditions. Treating the longest number as a universal deadline is misleading.
A useful next step
Keep contents and dates labelled, follow commercial packaging and current food-safety advice, and use the chart only as the manual explains. Record interruptions separately from routine storage duration.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.