I think it’s generally accepted that those of us that live in the east must substitute intensity for volume in the winter months, at least on the bike. Some of us get to go longer than others at least on weekends. I can usually ride 2.5-3.5 hours semi comfortably on weekends in the northern part of VA. I find that long enough to maintain a good bit of aerobic base bike fitness with a harder session thrown in during the week.
I’m sure I speak for many here though when I say I tend to swim and run a ton in winter months. We don’t get much snow here, but are still greatly affected cycling by available daylight. Gordo gets to live in the summer of NZ right now. Rich is a sensible man sensitive to us east coasters.