help me understand transit time, I have read the wiki twice

Slightly embarrassed to be asking this, but: help me understand transit time, I have read the wiki twice.

Posted my first lane report here without the month and got asked for it. Fair, and the table is better for the fussiness.

The regional stock question, and why it is the first thing I ask now.

If a supplier holds the line you want in a warehouse in your own region, your order is a domestic shipment. No international leg, no clearance, a shorter cold exposure and a lead time in days rather than weeks. If they do not, it is an international shipment however it is described at checkout.

So the question is not "how fast do you ship" but "which lines do you hold in regional stock, and is the one I want among them". It is one email, the answer is usually a list, and it changes what to order and when — especially in summer.

Where the time actually goes, which I got wrong for two years.

Total transit is first mile, international leg, customs clearance and last mile. I had been attributing everything to the international leg because that is the part with the exotic-sounding name.

When I finally logged the stages separately, the international leg was the most consistent part of the whole journey. The variance was in clearance and in the domestic delivery at my end — neither of which the supplier controls. That reframed how I read every lane report on this board, and it is why the table separates the stages.

Corrections welcome, especially the pedantic ones. Pedantry is how this board earns its reputation.