What is the real-world lead time from Guangzhou to the United States in winter?

The specifics, since they change the answer: Guangzhou · the United States.

I would like help reading this properly rather than being told what conclusion to reach.

I have the full report including the method section, so I can quote specifics if that helps.

What would I need in addition before this supported a decision?

Start with the physical state. Lyophilised powder is stable at ambient for the duration of any normal lane; anything in solution is a different conversation entirely.

A single phase-change pack in a thin-walled box holds below ten degrees for roughly one to two days at twenty-five degrees ambient and under a day at thirty-five. On a twelve-day lane the material is at ambient for most of the journey regardless of what was packed.

Tracking quality is the more informative signal: continuous scanning at every hop indicates a real logistics chain, and a tracking number that goes dark for a week indicates something else.

Solid-state stability of lyophilised peptides at ambient is well documented in formulation studies, with residual moisture as the dominant variable.

Nothing here is medical advice, and research-use compounds are not approved for human use.

Buy a data logger if the temperature history genuinely matters to you.

Answering this needs the origin and destination pair, because lane behaviour varies far more than carrier marketing suggests.

Anything shipped in solution is a genuinely different risk, because hydrolysis and deamidation proceed in the aqueous phase and are strongly temperature-dependent.

That is the argument for shipping lyophilised. A dry powder with low residual moisture is chemically stable at ambient for months; the degradation pathways that matter need water.

Single-use temperature loggers are inexpensive and are standard practice in any supply chain where temperature actually matters.

A cold pack that arrived hard tells you about the last day of transit and nothing about the first eleven.

Judge the lane by tracking continuity rather than by days elapsed.

The short version: nine to fourteen days is normal, the pack is spent within two, and the solid does not mind.

A single-use temperature data logger costs a few pounds and converts speculation into a record. If the temperature history matters to you, buy one rather than arguing about packaging.

Worth being precise here: asking a supplier to hold a shipment during a heatwave is a reasonable request that the better ones honour, and it costs a week rather than an order.

The caveat is that a warm transit is survivable for a solid and not for a solution, and the difference is not marginal.

A liquefied pack on arrival is expected. It is not evidence of a problem.

The honest answer is that a liquefied cold pack on arrival is expected rather than alarming.

Reported ranges from Chinese origins to western Europe cluster around nine to fourteen days with tracking, with inland origins adding a domestic leg and coastal ones sometimes beating the range.

Phase-change pack hold times are a function of mass, latent heat and box insulation, and published figures for small parcels are on the order of a day or two.

Lyophilised solids tolerate ambient transit. That is the whole answer for most orders.