I've been making quite a few prints over the last 3-4 days, but often turn off the machine between prints while I tweak a design. Having the much faster start is really nice with 24V. Really does save me time. Not too worried about the wire gauge, although I hadn't thought about it before. I figure at 24V the extruder is on for less time for a specific heat than if it was running at 19V. I presume some kind of pulse width modulation is used to maintain the temp. I also suspect the same wires/design/PCB is used for the R2 that uses 24V, but don't know.