wow is just from my limited experience. I have 2 hens that are going through just their second winter and are just finishing up their first molt. I also have two August hatched hens and one just started laying.
My older ones barely slowed down at all last winter. This winter, during their molt, they slowed down but probably never skipped more than 4 days.
So, some of that wow, along with my question to age and number of chickens, is ..... 'is this what I'm going to expect and when is it expected.'
My impression is that most people around here have more than 4 hens. I would guess the average is in the 8-12 range or more. So, if 8 layers cold stop for 1.5 - 2 months, I am pretty surprised. I would have guessed up to 75% reduction .... but not a cold stop.
Again ... very limited experience ... but I'm surprised. thus ... .wow.