Short answer

Derive the required transport window from your route and product requirements; do not copy hours from a catalogue. Specify load, starting condition, ambient profile, coolant, opening plan, sensor location, test duration and product-owner acceptance limit. Define raw data and repetitions before testing starts.

Cooling duration is not comparable without test conditions and an acceptance limit. It results from the container, load, coolant and use together.

Write the scenario into the specification

Set the product's transport range and required route window. Define full load, product starting condition, coolant type and quantity, ambient profile, sun exposure and lid-opening pattern.

State sensor position relative to the product and any other critical points. Agree test duration, logging interval, number of repetitions and raw-data delivery before testing. The product owner supplies the range and acceptance limit.

Draft acceptance clause. Under [stated load] and [coolant configuration], in [stated ambient conditions and opening pattern], the [product-owner-defined range] shall be maintained at [sensor locations] for the test window. Raw records and repeated-test report shall be supplied.

Compare bids against the same scenario. Different load, route, season or sensor position may need new validation; one test is not a universal hours guarantee.

What scenario should a cooling-duration clause specify?

Short answer

Write the scenario into the specification

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