I had a feeling someone would bring up Ohm’s law, and that’s why I said “in practice” and not “in theory”, because you are correct, in theory a shorter cable means less resistance means faster charging.

In practice, a 1m usb cable has less than 1 ohm resistance; I would imagine the difference in charge time between a 1cm cable and a 2m cable would be measured in seconds.

Also yeah, MagSafe is relatively inefficient for charging, but it is one of the most efficient methods of wireless charging, if not the most efficient (because alignment magnets).

A longer cable wouldn’t change much at all in this equation. You can test this yourself with a usb c extension cable (assuming it supports the necessary PD standards).