Zhege
361
How long for a Perpetual Calendar to make the Feb/Mar change?
For a Moser Perpetual 1: instantaneous
For a GO Senator Perpetual: about 6 hours. The change started a little after 7 PM. Here's the 29th showing perfectly centered...

You can tell it is for the current year and not a leap year due to the black dot in the year indicator aperture below the GO logo. It is amusing to see the dates marching through the 31st of February

I wore the GO for the evening of Feb 28, since it provides many opportunities for enjoying the changeover. With the Moser, a blink and you've missed it.
How long did yours take?